<?xml version="1.0" encoding="US-ASCII"?>
<!-- Generated by Broadridge Transform (tm) - http://www.broadridge.com -->
<!-- Created: Thu Aug 13 20:31:29 UTC 2026 -->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <roleRef xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel" roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
  <roleRef xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" roleURI="http://www.xbrl.org/2009/role/netLabel"/>
  <roleRef xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" roleURI="http://www.xbrl.org/2009/role/negatedLabel"/>
  <labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <loc xlink:type="locator" xlink:label="us-gaap_StatementOfFinancialPositionAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfFinancialPositionAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xml:lang="en-US">Assets:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_StatementOfFinancialPositionAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_Assets" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Assets_lbl" xml:lang="en-US">Total Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_Liabilities" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_Liabilities_lbl" xml:lang="en-US">Total Liabilities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquity" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_StockholdersEquity_lbl" xml:lang="en-US">Total Net Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xml:lang="en-US">Total Liabilities and Net Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_GrossInvestmentIncomeOperating" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_GrossInvestmentIncomeOperating_lbl" xml:lang="en-US">Total investment income from non-controlled/non-affiliated investments and cash equivalents:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GrossInvestmentIncomeOperating" xlink:to="us-gaap_GrossInvestmentIncomeOperating_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentIncomeNet" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeNet"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_InvestmentIncomeNet_lbl" xml:lang="en-US">Total Investment Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeNet" xlink:to="us-gaap_InvestmentIncomeNet_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OperatingExpenses" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_OperatingExpenses_lbl" xml:lang="en-US">Total Expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetExpensesOperating" xlink:href="muzi-20260630.xsd#muzi_NetExpensesOperating"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="muzi_NetExpensesOperating_lbl" xml:lang="en-US">Total Net Expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetExpensesOperating" xlink:to="muzi_NetExpensesOperating_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetInvestmentIncome" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentIncome"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetInvestmentIncome_lbl" xml:lang="en-US">Net Investment Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetInvestmentIncome" xlink:to="us-gaap_NetInvestmentIncome_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetInvestmentIncome_lbl0" xml:lang="en-US">Net investment income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetInvestmentIncome" xlink:to="us-gaap_NetInvestmentIncome_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RealizedInvestmentGainsLosses" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealizedInvestmentGainsLosses"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_RealizedInvestmentGainsLosses_lbl" xml:lang="en-US">Total Net Realized Gains/(Losses) on Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RealizedInvestmentGainsLosses" xlink:to="us-gaap_RealizedInvestmentGainsLosses_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RealizedInvestmentGainsLosses_lbl0" xml:lang="en-US">Total net realized gains/(losses)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RealizedInvestmentGainsLosses" xlink:to="us-gaap_RealizedInvestmentGainsLosses_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_RealizedInvestmentGainsLosses_lbl1" xml:lang="en-US">Net realized (gains)/losses on investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RealizedInvestmentGainsLosses" xlink:to="us-gaap_RealizedInvestmentGainsLosses_lbl1"/>
    <loc xlink:type="locator" xlink:label="us-gaap_UnrealizedGainLossOnInvestments" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossOnInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_UnrealizedGainLossOnInvestments_lbl" xml:lang="en-US">Total Net Change in Unrealized Appreciation/(Depreciation) on Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnrealizedGainLossOnInvestments" xlink:to="us-gaap_UnrealizedGainLossOnInvestments_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_UnrealizedGainLossOnInvestments_lbl0" xml:lang="en-US">Total net change in unrealized appreciation/(depreciation)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnrealizedGainLossOnInvestments" xlink:to="us-gaap_UnrealizedGainLossOnInvestments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_UnrealizedGainLossOnInvestments_lbl1" xml:lang="en-US">Net change in unrealized (appreciation)/depreciation on investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnrealizedGainLossOnInvestments" xlink:to="us-gaap_UnrealizedGainLossOnInvestments_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_UnrealizedGainLossOnInvestments_lbl2" xml:lang="en-US">Net Change in Unrealized Appreciation/(Depreciation)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnrealizedGainLossOnInvestments" xlink:to="us-gaap_UnrealizedGainLossOnInvestments_lbl2"/>
    <loc xlink:type="locator" xlink:label="us-gaap_GainLossOnInvestments" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_GainLossOnInvestments_lbl" xml:lang="en-US">Total Net Realized Gains/(Losses) and Unrealized Appreciation/(Depreciation) on Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainLossOnInvestments" xlink:to="us-gaap_GainLossOnInvestments_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetIncomeLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetIncomeLoss_lbl" xml:lang="en-US">Net Increase (Decrease) in Net Assets Resulting from Operations</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetIncomeLoss_lbl0" xml:lang="en-US">Net increase/(decrease) in net assets resulting from operations</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_NetIncomeLoss_lbl1" xml:lang="en-US">Net increase in net assets resulting from operations</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl1"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyDividendDistribution" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyDividendDistribution"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:label="us-gaap_InvestmentCompanyDividendDistribution_lbl" xml:lang="en-US">Decrease in Net Assets Resulting from Stockholder Distributions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDividendDistribution" xlink:to="us-gaap_InvestmentCompanyDividendDistribution_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction_lbl" xml:lang="en-US">Net Increase in Net Assets Resulting from Capital Stock Transactions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction" xlink:to="us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction_lbl0" xml:lang="en-US">Aggregate purchase price</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction" xlink:to="us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AssetsNet" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsNet"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_AssetsNet_lbl" xml:lang="en-US">Net Assets, Beginning of Period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsNet" xlink:to="us-gaap_AssetsNet_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_AssetsNet_lbl0" xml:lang="en-US">Net Assets, End of Period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsNet" xlink:to="us-gaap_AssetsNet_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xml:lang="en-US">Cash Provided by (Used in) Financing Activities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl" xml:lang="en-US">Net Increase/(Decrease) in Cash and Cash Equivalents</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xml:lang="en-US">Cash and cash equivalents, beginning of period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl0" xml:lang="en-US">Cash and Cash Equivalents, End of Period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xml:lang="en-US">Organization [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:to="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccountingPoliciesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl" xml:lang="en-US">Summary of Significant Accounting Policies [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_AccountingPoliciesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DistributionRecordDateAxis" xlink:href="muzi-20260630.xsd#muzi_DistributionRecordDateAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DistributionRecordDateAxis_lbl" xml:lang="en-US">Distribution Record Date [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionRecordDateAxis" xlink:to="muzi_DistributionRecordDateAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_lbl" xml:lang="en-US">Distribution Type [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis" xlink:to="us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnATaxBasisAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnATaxBasisAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnATaxBasisAbstract_lbl" xml:lang="en-US">Schedule of Components of Total Distributable (Accumulated) Earnings (Losses) on Tax Basis [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnATaxBasisAbstract" xlink:to="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnATaxBasisAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RetainedEarningsUnappropriated" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsUnappropriated"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_RetainedEarningsUnappropriated_lbl" xml:lang="en-US">Total undistributed earnings</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsUnappropriated" xlink:to="us-gaap_RetainedEarningsUnappropriated_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl" xml:lang="en-US">Total Distributable (Accumulated) Earnings/(Losses)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl0" xml:lang="en-US">Total distributable (accumulated) earnings (losses)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNetAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNetAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNetAbstract_lbl" xml:lang="en-US">Schedule of Costs of Investments [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNetAbstract" xlink:to="us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNetAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentsFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsFairValueDisclosure"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_InvestmentsFairValueDisclosure_lbl" xml:lang="en-US">Total investments at fair value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentsFairValueDisclosure" xlink:to="us-gaap_InvestmentsFairValueDisclosure_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentsFairValueDisclosure_lbl0" xml:lang="en-US">Non-controlled/non-affiliated investments, at fair value (amortized cost of $101,398,039 and $86,632,872, respectively)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentsFairValueDisclosure" xlink:to="us-gaap_InvestmentsFairValueDisclosure_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InvestmentsFairValueDisclosure_lbl1" xml:lang="en-US">Fair Value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentsFairValueDisclosure" xlink:to="us-gaap_InvestmentsFairValueDisclosure_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:label="us-gaap_InvestmentsFairValueDisclosure_lbl2" xml:lang="en-US">Fair value of investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentsFairValueDisclosure" xlink:to="us-gaap_InvestmentsFairValueDisclosure_lbl2"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributedEarningsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributedEarningsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributedEarningsAbstract_lbl" xml:lang="en-US">Schedule of Amounts Arising from Permanent Book/Tax Differences [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributedEarningsAbstract" xlink:to="us-gaap_DistributedEarningsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionsAbstract_lbl" xml:lang="en-US">Related Party Transactions [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionsAbstract" xlink:to="us-gaap_RelatedPartyTransactionsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract_lbl" xml:lang="en-US">Commitments and Contingencies [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:to="us-gaap_CommitmentsAndContingenciesDisclosureAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherCommitmentsAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherCommitmentsAxis_lbl" xml:lang="en-US">Other Commitments [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherCommitmentsAxis" xlink:to="us-gaap_OtherCommitmentsAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentsAbstract_lbl" xml:lang="en-US">Investments [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentsAbstract" xlink:to="us-gaap_InvestmentsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentTypeAxis_lbl" xml:lang="en-US">Investment Type [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LocationStatementsOfFinancialPositionBalanceAxis" xlink:href="muzi-20260630.xsd#muzi_LocationStatementsOfFinancialPositionBalanceAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LocationStatementsOfFinancialPositionBalanceAxis_lbl" xml:lang="en-US">Location, Statements of Financial Position, Balance [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LocationStatementsOfFinancialPositionBalanceAxis" xlink:to="muzi_LocationStatementsOfFinancialPositionBalanceAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquitySecuritiesByIndustryAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesByIndustryAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquitySecuritiesByIndustryAxis_lbl" xml:lang="en-US">Industry Sector [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquitySecuritiesByIndustryAxis" xlink:to="us-gaap_EquitySecuritiesByIndustryAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueDisclosuresAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueDisclosuresAbstract_lbl" xml:lang="en-US">Fair Value of Investments [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueDisclosuresAbstract" xlink:to="us-gaap_FairValueDisclosuresAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FinancialInstrumentAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xml:lang="en-US">Financial Instrument [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FinancialInstrumentAxis" xlink:to="us-gaap_FinancialInstrumentAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xml:lang="en-US">Fair Value Hierarchy and NAV [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentOwnedAtFairValue" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_InvestmentOwnedAtFairValue_lbl" xml:lang="en-US">Fair value, beginning of period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedAtFairValue" xlink:to="us-gaap_InvestmentOwnedAtFairValue_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_InvestmentOwnedAtFairValue_lbl0" xml:lang="en-US">Fair value, end of period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedAtFairValue" xlink:to="us-gaap_InvestmentOwnedAtFairValue_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentOwnedAtFairValue_lbl1" xml:lang="en-US">Fair Value (in Dollars)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedAtFairValue" xlink:to="us-gaap_InvestmentOwnedAtFairValue_lbl1"/>
    <loc xlink:type="locator" xlink:label="srt_RangeAxis" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_RangeAxis_lbl" xml:lang="en-US">Statistical Measurement [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_RangeAxis" xlink:to="srt_RangeAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquityAbstract_lbl" xml:lang="en-US">Net Assets [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquityAbstract" xlink:to="us-gaap_EquityAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AwardDateAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardDateAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AwardDateAxis_lbl" xml:lang="en-US">Award Date [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AwardDateAxis" xlink:to="us-gaap_AwardDateAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xml:lang="en-US">Earnings Per Share [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareAbstract" xlink:to="us-gaap_EarningsPerShareAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_lbl" xml:lang="en-US">Schedule of Computation of Basic and Diluted Earnings Per Common Share [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialHighlightsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsAbstract_lbl" xml:lang="en-US">Consolidated Financial Highlights [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyFinancialHighlightsAbstract" xlink:to="us-gaap_InvestmentCompanyFinancialHighlightsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetAssetValuePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetAssetValuePerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_NetAssetValuePerShare_lbl" xml:lang="en-US">Net Asset Value, Beginning of Period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetAssetValuePerShare" xlink:to="us-gaap_NetAssetValuePerShare_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:label="us-gaap_NetAssetValuePerShare_lbl0" xml:lang="en-US">Net Asset Value, End of Period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetAssetValuePerShare" xlink:to="us-gaap_NetAssetValuePerShare_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetAssetValuePerShare_lbl1" xml:lang="en-US">Net Asset Value Per Share (in Dollars per share)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetAssetValuePerShare" xlink:to="us-gaap_NetAssetValuePerShare_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_NetAssetValuePerShare_lbl2" xml:lang="en-US">Net Asset Value per Share (in Dollars per share)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetAssetValuePerShare" xlink:to="us-gaap_NetAssetValuePerShare_lbl2"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SharesOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesOutstanding"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:label="us-gaap_SharesOutstanding_lbl" xml:lang="en-US">Shares Outstanding, End of Period (in Shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyTotalReturn" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyTotalReturn"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:label="us-gaap_InvestmentCompanyTotalReturn_lbl" xml:lang="en-US">Total Return</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyTotalReturn" xlink:to="us-gaap_InvestmentCompanyTotalReturn_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventsAbstract_lbl" xml:lang="en-US">Subsequent Events [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventsAbstract" xlink:to="us-gaap_SubsequentEventsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AssetsAbstract_lbl" xml:lang="en-US">Assets:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentOwnedAtCost" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedAtCost"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentOwnedAtCost_lbl" xml:lang="en-US">Amortized cost</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedAtCost" xlink:to="us-gaap_InvestmentOwnedAtCost_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InvestmentOwnedAtCost_lbl0" xml:lang="en-US">Amortized Cost (in Dollars)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedAtCost" xlink:to="us-gaap_InvestmentOwnedAtCost_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:label="us-gaap_InvestmentOwnedAtCost_lbl1" xml:lang="en-US">Amortized Cost</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedAtCost" xlink:to="us-gaap_InvestmentOwnedAtCost_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentOwnedAtCost_lbl2" xml:lang="en-US">Costs of investments (in Dollars)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedAtCost" xlink:to="us-gaap_InvestmentOwnedAtCost_lbl2"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl" xml:lang="en-US">Cash and cash equivalents</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl0" xml:lang="en-US">Cash and cash equivalents (in Dollars)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ReceivablesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivablesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ReceivablesAbstract_lbl" xml:lang="en-US">Receivables:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ReceivablesAbstract" xlink:to="us-gaap_ReceivablesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InterestReceivable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestReceivable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestReceivable_lbl" xml:lang="en-US">Interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestReceivable" xlink:to="us-gaap_InterestReceivable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ReceivableInvestmentSale" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivableInvestmentSale"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ReceivableInvestmentSale_lbl" xml:lang="en-US">Sales of investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ReceivableInvestmentSale" xlink:to="us-gaap_ReceivableInvestmentSale_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LiabilitiesAbstract_lbl" xml:lang="en-US">Liabilities:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_LiabilitiesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ManagementFeePayable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementFeePayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ManagementFeePayable_lbl" xml:lang="en-US">Management fees payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ManagementFeePayable" xlink:to="us-gaap_ManagementFeePayable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent_lbl" xml:lang="en-US">Professional fees payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent" xlink:to="us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncentiveFeePayable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncentiveFeePayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncentiveFeePayable_lbl" xml:lang="en-US">Incentive fees payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncentiveFeePayable" xlink:to="us-gaap_IncentiveFeePayable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionPayable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionPayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DistributionPayable_lbl" xml:lang="en-US">Distributions payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionPayable" xlink:to="us-gaap_DistributionPayable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased_lbl" xml:lang="en-US">Directors&#8217; fees payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased" xlink:to="us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AccruedOtherGeneralAndAdministrativeExpenses" xlink:href="muzi-20260630.xsd#muzi_AccruedOtherGeneralAndAdministrativeExpenses"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AccruedOtherGeneralAndAdministrativeExpenses_lbl" xml:lang="en-US">Accrued other general and administrative expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AccruedOtherGeneralAndAdministrativeExpenses" xlink:to="muzi_AccruedOtherGeneralAndAdministrativeExpenses_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetRegulatoryAssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetRegulatoryAssetsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetRegulatoryAssetsAbstract_lbl" xml:lang="en-US">Net Assets:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetRegulatoryAssetsAbstract" xlink:to="us-gaap_NetRegulatoryAssetsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockValue" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockValue_lbl" xml:lang="en-US">Common Stock, $0.001 par value; 1,000,000 shares authorized, 99,826.75 shares issued and outstanding as of June 30, 2026 and 1,000,000 shares authorized, 94,721.62 shares issued and outstanding as of December 31, 2025</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockValue" xlink:to="us-gaap_CommonStockValue_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl" xml:lang="en-US">Common shares, par value (in Dollars per share)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl0" xml:lang="en-US">Common stock, par value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockSharesAuthorized" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xml:lang="en-US">Common shares, shares authorized (in Shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesAuthorized" xlink:to="us-gaap_CommonStockSharesAuthorized_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockSharesIssued" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesIssued"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xml:lang="en-US">Common shares, shares issued (in Shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockSharesOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xml:lang="en-US">Common shares, shares outstanding (in Shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl0" xml:lang="en-US">Common Shares Outstanding at the End of the Period (in Shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AdditionalPaidInCapital" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapital"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xml:lang="en-US">Additional paid-in capital</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapital" xlink:to="us-gaap_AdditionalPaidInCapital_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InterestIncomeOperatingAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeOperatingAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestIncomeOperatingAbstract_lbl" xml:lang="en-US">Investment Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestIncomeOperatingAbstract" xlink:to="us-gaap_InterestIncomeOperatingAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentIncomeFromNonControlledNonAffiliatedInvestmentsAndCashEquivalentsAbstract" xlink:href="muzi-20260630.xsd#muzi_InvestmentIncomeFromNonControlledNonAffiliatedInvestmentsAndCashEquivalentsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentIncomeFromNonControlledNonAffiliatedInvestmentsAndCashEquivalentsAbstract_lbl" xml:lang="en-US">Investment income from non-controlled/non-affiliated investments and cash equivalents:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentIncomeFromNonControlledNonAffiliatedInvestmentsAndCashEquivalentsAbstract" xlink:to="muzi_InvestmentIncomeFromNonControlledNonAffiliatedInvestmentsAndCashEquivalentsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentIncomeInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentIncomeInterest_lbl" xml:lang="en-US">Interest income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeInterest" xlink:to="us-gaap_InvestmentIncomeInterest_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InterestIncomeOperatingPaidInKind" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeOperatingPaidInKind"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestIncomeOperatingPaidInKind_lbl" xml:lang="en-US">Income from payment-in-kind interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestIncomeOperatingPaidInKind" xlink:to="us-gaap_InterestIncomeOperatingPaidInKind_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentIncomeOperatingAfterExpenseAndTaxAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeOperatingAfterExpenseAndTaxAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentIncomeOperatingAfterExpenseAndTaxAbstract_lbl" xml:lang="en-US">Expenses:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeOperatingAfterExpenseAndTaxAbstract" xlink:to="us-gaap_InvestmentIncomeOperatingAfterExpenseAndTaxAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ManagementFeeExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementFeeExpense"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ManagementFeeExpense_lbl" xml:lang="en-US">Management fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ManagementFeeExpense" xlink:to="us-gaap_ManagementFeeExpense_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProfessionalFees" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfessionalFees"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProfessionalFees_lbl" xml:lang="en-US">Professional fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProfessionalFees" xlink:to="us-gaap_ProfessionalFees_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NoninterestExpenseDirectorsFees" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpenseDirectorsFees"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NoninterestExpenseDirectorsFees_lbl" xml:lang="en-US">Directors&#8217; fees and expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NoninterestExpenseDirectorsFees" xlink:to="us-gaap_NoninterestExpenseDirectorsFees_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InterestExpenseOther" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOther"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestExpenseOther_lbl" xml:lang="en-US">Purchased accrued interest expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpenseOther" xlink:to="us-gaap_InterestExpenseOther_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncentiveFeeExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncentiveFeeExpense"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncentiveFeeExpense_lbl" xml:lang="en-US">Incentive fees expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncentiveFeeExpense" xlink:to="us-gaap_IncentiveFeeExpense_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IncentiveFeeExpense_lbl0" xml:lang="en-US">Incentive fees based</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncentiveFeeExpense" xlink:to="us-gaap_IncentiveFeeExpense_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherGeneralAndAdministrativeExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherGeneralAndAdministrativeExpense"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherGeneralAndAdministrativeExpense_lbl" xml:lang="en-US">Other general and administrative expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherGeneralAndAdministrativeExpense" xlink:to="us-gaap_OtherGeneralAndAdministrativeExpense_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_WaiverOfBaseManagementFees" xlink:href="muzi-20260630.xsd#muzi_WaiverOfBaseManagementFees"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_WaiverOfBaseManagementFees_lbl" xml:lang="en-US">Waiver of management fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_WaiverOfBaseManagementFees" xlink:to="muzi_WaiverOfBaseManagementFees_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetRealizedGainsLossesAndUnrealizedAppreciationDepreciationOnInvestmentsAbstract" xlink:href="muzi-20260630.xsd#muzi_NetRealizedGainsLossesAndUnrealizedAppreciationDepreciationOnInvestmentsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NetRealizedGainsLossesAndUnrealizedAppreciationDepreciationOnInvestmentsAbstract_lbl" xml:lang="en-US">Net Realized Gains/(Losses) and Unrealized Appreciation/(Depreciation) on Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetRealizedGainsLossesAndUnrealizedAppreciationDepreciationOnInvestmentsAbstract" xlink:to="muzi_NetRealizedGainsLossesAndUnrealizedAppreciationDepreciationOnInvestmentsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract_lbl" xml:lang="en-US">Net realized gains/(losses) on investments:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract" xlink:to="us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetRealizedGainsLossesAffiliatedInvestments" xlink:href="muzi-20260630.xsd#muzi_NetRealizedGainsLossesAffiliatedInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NetRealizedGainsLossesAffiliatedInvestments_lbl" xml:lang="en-US">Non-controlled/non-affiliated investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetRealizedGainsLossesAffiliatedInvestments" xlink:to="muzi_NetRealizedGainsLossesAffiliatedInvestments_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_UnrealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_UnrealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract_lbl" xml:lang="en-US">Net change in unrealized appreciation/(depreciation) on investments:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnrealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract" xlink:to="us-gaap_UnrealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareBasic_lbl" xml:lang="en-US">Basic Net Increase in Net Assets Resulting from Operations per Common Share (in Dollars per share)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasic" xlink:to="us-gaap_EarningsPerShareBasic_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_EarningsPerShareBasic_lbl0" xml:lang="en-US">Basic net increase (decrease) in net assets resulting from operations per common share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasic" xlink:to="us-gaap_EarningsPerShareBasic_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareDiluted" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xml:lang="en-US">Diluted net increase in net assets resulting from operations per common share (in Dollars per share)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareDiluted" xlink:to="us-gaap_EarningsPerShareDiluted_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_EarningsPerShareDiluted_lbl0" xml:lang="en-US">Diluted net increase (decrease) in net assets resulting from operations per common share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareDiluted" xlink:to="us-gaap_EarningsPerShareDiluted_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xml:lang="en-US">Weighted Average Common Shares Outstanding - Basic (in Shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl0" xml:lang="en-US">Weighted average shares of common stock outstanding&#8212;basic</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl" xml:lang="en-US">Weighted Average Common Shares Outstanding - Diluted (in Shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:to="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl0" xml:lang="en-US">Weighted average shares of common stock outstanding &#8211; diluted</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:to="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToReportingEntityAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract_lbl" xml:lang="en-US">Increase (Decrease) in Net Assets Resulting from Operations:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract" xlink:to="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyDistributionToShareholdersAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyDistributionToShareholdersAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyDistributionToShareholdersAbstract_lbl" xml:lang="en-US">Decrease in Net Assets Resulting from Stockholder Distributions:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributionToShareholdersAbstract" xlink:to="us-gaap_InvestmentCompanyDistributionToShareholdersAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract_lbl" xml:lang="en-US">Increase in Net Assets Resulting from Capital Stock Transactions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract" xlink:to="us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract_lbl0" xml:lang="en-US">Distributions to Common Stockholders</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract" xlink:to="us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xml:lang="en-US">Issuance of common shares</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_lbl" xml:lang="en-US">Dividends and distributions reinvested</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:to="us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityPeriodIncreaseDecrease" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityPeriodIncreaseDecrease"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockholdersEquityPeriodIncreaseDecrease_lbl" xml:lang="en-US">Total Increase in Net Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityPeriodIncreaseDecrease" xlink:to="us-gaap_StockholdersEquityPeriodIncreaseDecrease_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DividendsPayableAmount" xlink:href="muzi-20260630.xsd#muzi_DividendsPayableAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DividendsPayableAmount_lbl" xml:lang="en-US">Dividend Distribution per Share (in Dollars per share)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DividendsPayableAmount" xlink:to="muzi_DividendsPayableAmount_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US">Cash Flows from Operating Activities:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xml:lang="en-US">Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromSaleMaturityAndCollectionOfLongtermInvestments" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleMaturityAndCollectionOfLongtermInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromSaleMaturityAndCollectionOfLongtermInvestments_lbl" xml:lang="en-US">Sales and maturities of and principal paydowns on investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromSaleMaturityAndCollectionOfLongtermInvestments" xlink:to="us-gaap_ProceedsFromSaleMaturityAndCollectionOfLongtermInvestments_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ChangesInOperatingAssetsAndLiabilitiesAbstract" xlink:href="muzi-20260630.xsd#muzi_ChangesInOperatingAssetsAndLiabilitiesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ChangesInOperatingAssetsAndLiabilitiesAbstract_lbl" xml:lang="en-US">Changes in operating assets and liabilities:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ChangesInOperatingAssetsAndLiabilitiesAbstract" xlink:to="muzi_ChangesInOperatingAssetsAndLiabilitiesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable" xlink:href="muzi-20260630.xsd#muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable_lbl" xml:lang="en-US">Organizational and offering fees payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable" xlink:to="muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInManagementFeePayable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInManagementFeePayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInManagementFeePayable_lbl" xml:lang="en-US">Management fees payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInManagementFeePayable" xlink:to="us-gaap_IncreaseDecreaseInManagementFeePayable_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IncreaseDecreaseInDirectorsFeesPayable" xlink:href="muzi-20260630.xsd#muzi_IncreaseDecreaseInDirectorsFeesPayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IncreaseDecreaseInDirectorsFeesPayable_lbl" xml:lang="en-US">Directors&#8217; fees payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInDirectorsFeesPayable" xlink:to="muzi_IncreaseDecreaseInDirectorsFeesPayable_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IncreaseDecreaseInProfessionalFeesPayable" xlink:href="muzi-20260630.xsd#muzi_IncreaseDecreaseInProfessionalFeesPayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IncreaseDecreaseInProfessionalFeesPayable_lbl" xml:lang="en-US">Professional fees payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInProfessionalFeesPayable" xlink:to="muzi_IncreaseDecreaseInProfessionalFeesPayable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInSecurityDeposits" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInSecurityDeposits"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInSecurityDeposits_lbl" xml:lang="en-US">Securities purchased payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInSecurityDeposits" xlink:to="us-gaap_IncreaseDecreaseInSecurityDeposits_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInIncentiveFeePayable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInIncentiveFeePayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInIncentiveFeePayable_lbl" xml:lang="en-US">Incentive fees payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInIncentiveFeePayable" xlink:to="us-gaap_IncreaseDecreaseInIncentiveFeePayable_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses" xlink:href="muzi-20260630.xsd#muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses_lbl" xml:lang="en-US">Accrued other general and administrative expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses" xlink:to="muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xml:lang="en-US">Cash Flows from Financing Activities:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ProceedsFromAdvanceShareSubscriptionAmount" xlink:href="muzi-20260630.xsd#muzi_ProceedsFromAdvanceShareSubscriptionAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ProceedsFromAdvanceShareSubscriptionAmount_lbl" xml:lang="en-US">Changes in advance share subscription amount</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ProceedsFromAdvanceShareSubscriptionAmount" xlink:to="muzi_ProceedsFromAdvanceShareSubscriptionAmount_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl" xml:lang="en-US">Proceeds from issuance of common shares</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xml:lang="en-US">Supplemental Information</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="us-gaap_SupplementalCashFlowInformationAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DistributionsReinvested" xlink:href="muzi-20260630.xsd#muzi_DistributionsReinvested"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DistributionsReinvested_lbl" xml:lang="en-US">Dividends reinvested</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionsReinvested" xlink:to="muzi_DistributionsReinvested_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentsNonControlledNonAffiliatedAbstract" xlink:href="muzi-20260630.xsd#muzi_InvestmentsNonControlledNonAffiliatedAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentsNonControlledNonAffiliatedAbstract_lbl" xml:lang="en-US">Investments - non-controlled/non-affiliated</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentsNonControlledNonAffiliatedAbstract" xlink:to="muzi_InvestmentsNonControlledNonAffiliatedAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentCompanySpreadAboveIndex" xlink:href="muzi-20260630.xsd#muzi_InvestmentCompanySpreadAboveIndex"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentCompanySpreadAboveIndex_lbl" xml:lang="en-US">Spread Above Index</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanySpreadAboveIndex" xlink:to="muzi_InvestmentCompanySpreadAboveIndex_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentInterestRateFloor" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInterestRateFloor"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentInterestRateFloor_lbl" xml:lang="en-US">Floor</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentInterestRateFloor" xlink:to="us-gaap_InvestmentInterestRateFloor_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentInterestRate" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInterestRate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentInterestRate_lbl" xml:lang="en-US">Interest Rate/ Discount Rate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentInterestRate" xlink:to="us-gaap_InvestmentInterestRate_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentInterestRatePaidInKind" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInterestRatePaidInKind"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentInterestRatePaidInKind_lbl" xml:lang="en-US">Payment- In- Kind Interest Rate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentInterestRatePaidInKind" xlink:to="us-gaap_InvestmentInterestRatePaidInKind_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AcquisitionDate" xlink:href="muzi-20260630.xsd#muzi_AcquisitionDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AcquisitionDate_lbl" xml:lang="en-US">Acquisition Date(s)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AcquisitionDate" xlink:to="muzi_AcquisitionDate_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentMaturityDate" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentMaturityDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentMaturityDate_lbl" xml:lang="en-US">Maturity/ Expiration Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentMaturityDate" xlink:to="us-gaap_InvestmentMaturityDate_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentOwnedBalancePrincipalAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedBalancePrincipalAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentOwnedBalancePrincipalAmount_lbl" xml:lang="en-US">Principal/ Units (in Dollars)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedBalancePrincipalAmount" xlink:to="us-gaap_InvestmentOwnedBalancePrincipalAmount_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentOwnedPercentOfNetAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedPercentOfNetAssets"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentOwnedPercentOfNetAssets_lbl" xml:lang="en-US">Percentage of Net Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedPercentOfNetAssets" xlink:to="us-gaap_InvestmentOwnedPercentOfNetAssets_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InvestmentOwnedPercentOfNetAssets_lbl0" xml:lang="en-US">Percentage of net assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedPercentOfNetAssets" xlink:to="us-gaap_InvestmentOwnedPercentOfNetAssets_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:label="us-gaap_InvestmentOwnedPercentOfNetAssets_lbl1" xml:lang="en-US">Investment amount</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedPercentOfNetAssets" xlink:to="us-gaap_InvestmentOwnedPercentOfNetAssets_lbl1"/>
    <loc xlink:type="locator" xlink:label="muzi_NoncontrolledNonaffiliatedInvestments" xlink:href="muzi-20260630.xsd#muzi_NoncontrolledNonaffiliatedInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="muzi_NoncontrolledNonaffiliatedInvestments_lbl" xml:lang="en-US">Non-controlled/non-affiliated investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NoncontrolledNonaffiliatedInvestments" xlink:to="muzi_NoncontrolledNonaffiliatedInvestments_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyDistributionOrdinaryIncome" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyDistributionOrdinaryIncome"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_InvestmentCompanyDistributionOrdinaryIncome_lbl" xml:lang="en-US">Dividends and distributions to stockholders</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributionOrdinaryIncome" xlink:to="us-gaap_InvestmentCompanyDistributionOrdinaryIncome_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_lbl" xml:lang="en-US">Net amortization of premium (accretion of discount)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" xlink:to="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InterestAndDividendIncomeOperatingPaidInKind" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperatingPaidInKind"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_InterestAndDividendIncomeOperatingPaidInKind_lbl" xml:lang="en-US">Net income from payment-in-kind interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestAndDividendIncomeOperatingPaidInKind" xlink:to="us-gaap_InterestAndDividendIncomeOperatingPaidInKind_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PurchasesAndDrawdownsOfInvestments" xlink:href="muzi-20260630.xsd#muzi_PurchasesAndDrawdownsOfInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="muzi_PurchasesAndDrawdownsOfInvestments_lbl" xml:lang="en-US">Purchases and drawdowns of investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PurchasesAndDrawdownsOfInvestments" xlink:to="muzi_PurchasesAndDrawdownsOfInvestments_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInOtherReceivables" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherReceivables"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInOtherReceivables_lbl" xml:lang="en-US">Receivables - interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOtherReceivables" xlink:to="us-gaap_IncreaseDecreaseInOtherReceivables_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_lbl" xml:lang="en-US">Receivables - sale of investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables" xlink:to="us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PaymentsOfCapitalDistribution" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfCapitalDistribution"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_PaymentsOfCapitalDistribution_lbl" xml:lang="en-US">Distributions (net of change in distributions payable)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsOfCapitalDistribution" xlink:to="us-gaap_PaymentsOfCapitalDistribution_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentIdentifierAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIdentifierAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentIdentifierAxis_lbl" xml:lang="en-US">Investment, Identifier [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIdentifierAxis" xlink:to="us-gaap_InvestmentIdentifierAxis_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InvestmentIdentifierAxis_lbl0" xml:lang="en-US">Non-Controlled/Non-Affiliated Investments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIdentifierAxis" xlink:to="us-gaap_InvestmentIdentifierAxis_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xml:lang="en-US">Organization</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:to="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SignificantAccountingPoliciesTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xml:lang="en-US">Summary of Significant Accounting Policies</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLlcMemberByDistributionTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionsMadeToLimitedLiabilityCompanyLlcMemberByDistributionTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLlcMemberByDistributionTableTextBlock_lbl" xml:lang="en-US">Schedule of Distributions Declared</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLlcMemberByDistributionTableTextBlock" xlink:to="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLlcMemberByDistributionTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDeclarationDate" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDeclarationDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDeclarationDate_lbl" xml:lang="en-US">Record Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDeclarationDate" xlink:to="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDeclarationDate_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionDate" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionDate_lbl" xml:lang="en-US">Payment Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionDate" xlink:to="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionDate_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit_lbl" xml:lang="en-US">Distribution Rate per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit" xlink:to="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid_lbl" xml:lang="en-US">Distribution Paid</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid" xlink:to="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock_lbl" xml:lang="en-US">Schedule of Components of Total Distributable (Accumulated) Earnings/(Losses) on a Tax Basis</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock" xlink:to="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss_lbl" xml:lang="en-US">Undistributed ordinary income&#8212;net</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss" xlink:to="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficitAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficitAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficitAbstract_lbl" xml:lang="en-US">Capital loss carryforward</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficitAbstract" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficitAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm" xlink:href="muzi-20260630.xsd#muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm_lbl" xml:lang="en-US">Perpetual short-term capital loss carryforward</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm" xlink:to="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedTemporaryDifferenceOther" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedTemporaryDifferenceOther"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedTemporaryDifferenceOther_lbl" xml:lang="en-US">Timing differences (organizational costs/other)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedTemporaryDifferenceOther" xlink:to="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedTemporaryDifferenceOther_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_UnrealizedEarningsLossesnet" xlink:href="muzi-20260630.xsd#muzi_UnrealizedEarningsLossesnet"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_UnrealizedEarningsLossesnet_lbl" xml:lang="en-US">Unrealized earnings (losses)&#8212;net</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_UnrealizedEarningsLossesnet" xlink:to="muzi_UnrealizedEarningsLossesnet_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentIncomeTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentIncomeTextBlock_lbl" xml:lang="en-US">Schedule of Costs of Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeTextBlock" xlink:to="us-gaap_InvestmentIncomeTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes_lbl" xml:lang="en-US">Tax cost</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes" xlink:to="us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedAppreciation" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TaxBasisOfInvestmentsGrossUnrealizedAppreciation"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedAppreciation_lbl" xml:lang="en-US">Gross unrealized appreciation on investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedAppreciation" xlink:to="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedAppreciation_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock_lbl" xml:lang="en-US">Schedule of Amounts Arising from Permanent Book/Tax Differences</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock" xlink:to="muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences" xlink:href="muzi-20260630.xsd#muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences_lbl" xml:lang="en-US">Additional paid-in capital</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences" xlink:to="muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_TotalDistributableEarnings" xlink:href="muzi-20260630.xsd#muzi_TotalDistributableEarnings"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_TotalDistributableEarnings_lbl" xml:lang="en-US">Total distributable earnings</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TotalDistributableEarnings" xlink:to="muzi_TotalDistributableEarnings_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xml:lang="en-US">Related Party Transactions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:to="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl" xml:lang="en-US">Commitments and Contingencies</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:to="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherCommitmentsTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherCommitmentsTableTextBlock_lbl" xml:lang="en-US">Schedule of Unfunded Commitments to Provide Debt Financing</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherCommitmentsTableTextBlock" xlink:to="us-gaap_OtherCommitmentsTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_UnfundedCommitmentsExpirationDate" xlink:href="muzi-20260630.xsd#muzi_UnfundedCommitmentsExpirationDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_UnfundedCommitmentsExpirationDate_lbl" xml:lang="en-US">Expiration Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_UnfundedCommitmentsExpirationDate" xlink:to="muzi_UnfundedCommitmentsExpirationDate_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyCommittedCapital" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyCommittedCapital"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyCommittedCapital_lbl" xml:lang="en-US">Total unfunded commitments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyCommittedCapital" xlink:to="us-gaap_InvestmentCompanyCommittedCapital_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentTextBlock_lbl" xml:lang="en-US">Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentTextBlock" xlink:to="us-gaap_InvestmentTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentTableTextBlock_lbl" xml:lang="en-US">Schedule of Investment Portfolio at Amortized Cost and Fair Value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentTableTextBlock" xlink:to="us-gaap_InvestmentTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyChangesInNetAssetsTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyChangesInNetAssetsTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyChangesInNetAssetsTableTextBlock_lbl" xml:lang="en-US">Schedule of Investments Based on Fair Value as a Percentage of Net Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyChangesInNetAssetsTableTextBlock" xlink:to="us-gaap_InvestmentCompanyChangesInNetAssetsTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueDisclosuresTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosuresTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl" xml:lang="en-US">Fair Value of Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueDisclosuresTextBlock" xlink:to="us-gaap_FairValueDisclosuresTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xml:lang="en-US">Schedule of Fair Value Hierarchy</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:to="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_lbl" xml:lang="en-US">Schedule of Changes in the Fair Value of Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_lbl" xml:lang="en-US">Purchases of investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetChangeInUnrealizedAppreciationdepreciation" xlink:href="muzi-20260630.xsd#muzi_NetChangeInUnrealizedAppreciationdepreciation"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NetChangeInUnrealizedAppreciationdepreciation_lbl" xml:lang="en-US">Net change in unrealized appreciation/(depreciation)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetChangeInUnrealizedAppreciationdepreciation" xlink:to="muzi_NetChangeInUnrealizedAppreciationdepreciation_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetAccretionOfDiscountOnInvestments" xlink:href="muzi-20260630.xsd#muzi_NetAccretionOfDiscountOnInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NetAccretionOfDiscountOnInvestments_lbl" xml:lang="en-US">Net accretion of discount (amortization of discount) on investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAccretionOfDiscountOnInvestments" xlink:to="muzi_NetAccretionOfDiscountOnInvestments_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_Paymentinkind" xlink:href="muzi-20260630.xsd#muzi_Paymentinkind"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_Paymentinkind_lbl" xml:lang="en-US">Payment-in-kind interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_Paymentinkind" xlink:to="muzi_Paymentinkind_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_lbl" xml:lang="en-US">Transfers into (out of) Level 3</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock_lbl" xml:lang="en-US">Schedule of Net Change in Unrealized Appreciation (Depreciation)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock" xlink:to="muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_lbl" xml:lang="en-US">Schedule of Information about Significant Unobservable Inputs of Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique" xlink:href="muzi-20260630.xsd#muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique_lbl" xml:lang="en-US">Valuation Technique</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique" xlink:to="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementsSensitivityAnalysisDescription" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsSensitivityAnalysisDescription"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueMeasurementsSensitivityAnalysisDescription_lbl" xml:lang="en-US">Unobservable Input</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementsSensitivityAnalysisDescription" xlink:to="us-gaap_FairValueMeasurementsSensitivityAnalysisDescription_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_FairValueSignificantUnobservableRangeInput" xlink:href="muzi-20260630.xsd#muzi_FairValueSignificantUnobservableRangeInput"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_FairValueSignificantUnobservableRangeInput_lbl" xml:lang="en-US">Range/Input</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueSignificantUnobservableRangeInput" xlink:to="muzi_FairValueSignificantUnobservableRangeInput_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetAssetValuePerSharePercentEquitySecurities" xlink:href="muzi-20260630.xsd#muzi_NetAssetValuePerSharePercentEquitySecurities"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NetAssetValuePerSharePercentEquitySecurities_lbl" xml:lang="en-US">Weighted Average Inputs</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAssetValuePerSharePercentEquitySecurities" xlink:to="muzi_NetAssetValuePerSharePercentEquitySecurities_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl" xml:lang="en-US">Net Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:to="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfStockholdersEquityTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfStockholdersEquityTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfStockholdersEquityTableTextBlock_lbl" xml:lang="en-US">Schedule of Common Stock Issuances</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfStockholdersEquityTableTextBlock" xlink:to="us-gaap_ScheduleOfStockholdersEquityTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xml:lang="en-US">Shares issued and sold</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfIncentiveDistributionsMadeToManagingMembersOrGeneralPartnersByDistributionTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfIncentiveDistributionsMadeToManagingMembersOrGeneralPartnersByDistributionTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfIncentiveDistributionsMadeToManagingMembersOrGeneralPartnersByDistributionTextBlock_lbl" xml:lang="en-US">Schedule of Company Declared Distributions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfIncentiveDistributionsMadeToManagingMembersOrGeneralPartnersByDistributionTextBlock" xlink:to="us-gaap_ScheduleOfIncentiveDistributionsMadeToManagingMembersOrGeneralPartnersByDistributionTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetAssetsPayableDate" xlink:href="muzi-20260630.xsd#muzi_NetAssetsPayableDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NetAssetsPayableDate_lbl" xml:lang="en-US">Payment Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAssetsPayableDate" xlink:to="muzi_NetAssetsPayableDate_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyTaxReturnOfCapitalDistributionPerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyTaxReturnOfCapitalDistributionPerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyTaxReturnOfCapitalDistributionPerShare_lbl" xml:lang="en-US">Distribution Rate per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyTaxReturnOfCapitalDistributionPerShare" xlink:to="us-gaap_InvestmentCompanyTaxReturnOfCapitalDistributionPerShare_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyTaxBasisTaxableIncomeLossBeforeDeductionForDistribution" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyTaxBasisTaxableIncomeLossBeforeDeductionForDistribution"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyTaxBasisTaxableIncomeLossBeforeDeductionForDistribution_lbl" xml:lang="en-US">Distribution Paid</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyTaxBasisTaxableIncomeLossBeforeDeductionForDistribution" xlink:to="us-gaap_InvestmentCompanyTaxBasisTaxableIncomeLossBeforeDeductionForDistribution_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfSharesIssuedTableTextBlock" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfSharesIssuedTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ScheduleOfSharesIssuedTableTextBlock_lbl" xml:lang="en-US">Schedule of Shares Issued</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfSharesIssuedTableTextBlock" xlink:to="muzi_ScheduleOfSharesIssuedTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DebtInstrumentIssuanceDate1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentIssuanceDate1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentIssuanceDate1_lbl" xml:lang="en-US">Issuance Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentIssuanceDate1" xlink:to="us-gaap_DebtInstrumentIssuanceDate1_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SharesIssuedPricePerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharesIssuedPricePerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xml:lang="en-US">Shares Issued</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssuedPricePerShare" xlink:to="us-gaap_SharesIssuedPricePerShare_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl" xml:lang="en-US">Earnings Per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareTextBlock" xlink:to="us-gaap_EarningsPerShareTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl" xml:lang="en-US">Schedule of Basic and Diluted Earnings Per Common Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:to="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialHighlightsTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsTextBlock_lbl" xml:lang="en-US">Consolidated Financial Highlights</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyFinancialHighlightsTextBlock" xlink:to="us-gaap_InvestmentCompanyFinancialHighlightsTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock_lbl" xml:lang="en-US">Schedule of Consolidated Financial Highlights</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock" xlink:to="us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShareAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShareAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShareAbstract_lbl" xml:lang="en-US">Per Common Share Operating Performance</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShareAbstract" xlink:to="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShareAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShareAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyGainLossOnInvestmentPerShareAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShareAbstract_lbl" xml:lang="en-US">Results of Operations:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShareAbstract" xlink:to="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShareAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare_lbl" xml:lang="en-US">Net Investment Income/(Loss)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare" xlink:to="us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyGainLossOnInvestmentPerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShare_lbl" xml:lang="en-US">Net Realized Gains/(Losses) and Unrealized Appreciation/(Depreciation)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShare" xlink:to="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShare_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare_lbl" xml:lang="en-US">Net Increase (Decrease) in Net Assets Resulting from Operations</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare" xlink:to="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyFinancialRatiosAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialRatiosAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyFinancialRatiosAbstract_lbl" xml:lang="en-US">Ratio/Supplemental Data</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyFinancialRatiosAbstract" xlink:to="us-gaap_InvestmentCompanyFinancialRatiosAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NetRegulatoryAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetRegulatoryAssets"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NetRegulatoryAssets_lbl" xml:lang="en-US">Net assets, end of Period (in Dollars)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetRegulatoryAssets" xlink:to="us-gaap_NetRegulatoryAssets_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_WeightedaverageSharesOutstanding" xlink:href="muzi-20260630.xsd#muzi_WeightedaverageSharesOutstanding"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_WeightedaverageSharesOutstanding_lbl" xml:lang="en-US">Weighted-average shares outstanding</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_WeightedaverageSharesOutstanding" xlink:to="muzi_WeightedaverageSharesOutstanding_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyPortfolioTurnover" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyPortfolioTurnover"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyPortfolioTurnover_lbl" xml:lang="en-US">Portfolio turnover</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyPortfolioTurnover" xlink:to="us-gaap_InvestmentCompanyPortfolioTurnover_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement" xlink:href="muzi-20260630.xsd#muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement_lbl" xml:lang="en-US">Ratio of total expenses to average net assets with reimbursement</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement" xlink:to="muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement" xlink:href="muzi-20260630.xsd#muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement_lbl" xml:lang="en-US">Ratio of total expenses to average net assets without reimbursement</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement" xlink:to="muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyIncentiveAllocationToAverageNetAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyIncentiveAllocationToAverageNetAssets"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyIncentiveAllocationToAverageNetAssets_lbl" xml:lang="en-US">Ratio of net investment income/(loss) to average net assets with reimbursement</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyIncentiveAllocationToAverageNetAssets" xlink:to="us-gaap_InvestmentCompanyIncentiveAllocationToAverageNetAssets_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventsTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventsTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SubsequentEventsTextBlock_lbl" xml:lang="en-US">Subsequent Events</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventsTextBlock" xlink:to="us-gaap_SubsequentEventsTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation_lbl" xml:lang="en-US">Gross unrealized depreciation on investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation" xlink:to="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_lbl" xml:lang="en-US">Proceeds from principal pre-payments and sales of investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_lbl" xml:lang="en-US">Net realized gain (loss)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyDistributionToShareholdersPerShare" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyDistributionToShareholdersPerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_InvestmentCompanyDistributionToShareholdersPerShare_lbl" xml:lang="en-US">Distributions from Net Investment Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributionToShareholdersPerShare" xlink:to="us-gaap_InvestmentCompanyDistributionToShareholdersPerShare_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease_lbl" xml:lang="en-US">Net Decrease in Net Assets Resulting from Distributions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease" xlink:to="us-gaap_InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MayEightTwoZeroTwoSixMember" xlink:href="muzi-20260630.xsd#muzi_MayEightTwoZeroTwoSixMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MayEightTwoZeroTwoSixMember_lbl" xml:lang="en-US">May 8, 2026 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MayEightTwoZeroTwoSixMember" xlink:to="muzi_MayEightTwoZeroTwoSixMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CashDistributionMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashDistributionMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CashDistributionMember_lbl" xml:lang="en-US">Cash Distribution [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashDistributionMember" xlink:to="us-gaap_CashDistributionMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_CashDistributionMember_lbl0" xml:lang="en-US">Distributions [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashDistributionMember" xlink:to="us-gaap_CashDistributionMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_MarchTwentyOneTwoZeroTwoFiveMember" xlink:href="muzi-20260630.xsd#muzi_MarchTwentyOneTwoZeroTwoFiveMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MarchTwentyOneTwoZeroTwoFiveMember_lbl" xml:lang="en-US">March 21, 2025 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MarchTwentyOneTwoZeroTwoFiveMember" xlink:to="muzi_MarchTwentyOneTwoZeroTwoFiveMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MayThirteenTwoZeroTwoFiveMember" xlink:href="muzi-20260630.xsd#muzi_MayThirteenTwoZeroTwoFiveMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MayThirteenTwoZeroTwoFiveMember_lbl" xml:lang="en-US">May 13, 2025 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MayThirteenTwoZeroTwoFiveMember" xlink:to="muzi_MayThirteenTwoZeroTwoFiveMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CarolinaCenterForAutismServicesMember" xlink:href="muzi-20260630.xsd#muzi_CarolinaCenterForAutismServicesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CarolinaCenterForAutismServicesMember_lbl" xml:lang="en-US">Carolina Center for Autism Services, LLC Delayed Draw Term Loan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CarolinaCenterForAutismServicesMember" xlink:to="muzi_CarolinaCenterForAutismServicesMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CorporateBondInvestmentsMember" xlink:href="muzi-20260630.xsd#muzi_CorporateBondInvestmentsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CorporateBondInvestmentsMember_lbl" xml:lang="en-US">Corporate Bond Investments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CorporateBondInvestmentsMember" xlink:to="muzi_CorporateBondInvestmentsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_SeniorSecuredLoanDebtInstrumentsMember" xlink:href="muzi-20260630.xsd#muzi_SeniorSecuredLoanDebtInstrumentsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_SeniorSecuredLoanDebtInstrumentsMember_lbl" xml:lang="en-US">Senior Secured Loan Debt Investments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInstrumentsMember" xlink:to="muzi_SeniorSecuredLoanDebtInstrumentsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_EquityInvestmentsPreferredStockMember" xlink:href="muzi-20260630.xsd#muzi_EquityInvestmentsPreferredStockMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_EquityInvestmentsPreferredStockMember_lbl" xml:lang="en-US">Equity Investments &#8211; Preferred Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsPreferredStockMember" xlink:to="muzi_EquityInvestmentsPreferredStockMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="muzi_EquityInvestmentsPreferredStockMember_lbl0" xml:lang="en-US">Equity Investments - Preferred Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsPreferredStockMember" xlink:to="muzi_EquityInvestmentsPreferredStockMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_WarrantMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WarrantMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_WarrantMember_lbl" xml:lang="en-US">Warrants [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantMember" xlink:to="us-gaap_WarrantMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_WarrantMember_lbl0" xml:lang="en-US">Warrant [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantMember" xlink:to="us-gaap_WarrantMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_MoneyMarketFundsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MoneyMarketFundsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_MoneyMarketFundsMember_lbl" xml:lang="en-US">Money Market Funds [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MoneyMarketFundsMember" xlink:to="us-gaap_MoneyMarketFundsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AmortizedCostMember" xlink:href="muzi-20260630.xsd#muzi_AmortizedCostMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AmortizedCostMember_lbl" xml:lang="en-US">Amortized Cost [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AmortizedCostMember" xlink:to="muzi_AmortizedCostMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_FairValueMember" xlink:href="muzi-20260630.xsd#muzi_FairValueMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_FairValueMember_lbl" xml:lang="en-US">Fair Value [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueMember" xlink:to="muzi_FairValueMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_TransportationExcludingAirRailMember" xlink:href="muzi-20260630.xsd#muzi_TransportationExcludingAirRailMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_TransportationExcludingAirRailMember_lbl" xml:lang="en-US">Transportation Excluding Air/Rail [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TransportationExcludingAirRailMember" xlink:to="muzi_TransportationExcludingAirRailMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_HomebuildersRealEstateMember" xlink:href="muzi-20260630.xsd#muzi_HomebuildersRealEstateMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_HomebuildersRealEstateMember_lbl" xml:lang="en-US">Homebuilders/Real Estate [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_HomebuildersRealEstateMember" xlink:to="muzi_HomebuildersRealEstateMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_HealthcareSectorMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HealthcareSectorMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_HealthcareSectorMember_lbl" xml:lang="en-US">Health Care Services [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_HealthcareSectorMember" xlink:to="us-gaap_HealthcareSectorMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DiversifiedFinancialServicesMember" xlink:href="muzi-20260630.xsd#muzi_DiversifiedFinancialServicesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DiversifiedFinancialServicesMember_lbl" xml:lang="en-US">Diversified Financial Services	[Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiversifiedFinancialServicesMember" xlink:to="muzi_DiversifiedFinancialServicesMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_BuildingMaterialsMember" xlink:href="muzi-20260630.xsd#muzi_BuildingMaterialsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_BuildingMaterialsMember_lbl" xml:lang="en-US">Building Materials [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_BuildingMaterialsMember" xlink:to="muzi_BuildingMaterialsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ServicesMember" xlink:href="muzi-20260630.xsd#muzi_ServicesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ServicesMember_lbl" xml:lang="en-US">Services [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ServicesMember" xlink:to="muzi_ServicesMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DiversifiedSupportServicesMember" xlink:href="muzi-20260630.xsd#muzi_DiversifiedSupportServicesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DiversifiedSupportServicesMember_lbl" xml:lang="en-US">Diversified Support Services [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiversifiedSupportServicesMember" xlink:to="muzi_DiversifiedSupportServicesMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_HealthCareMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HealthCareMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_HealthCareMember_lbl" xml:lang="en-US">Healthcare [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_HealthCareMember" xlink:to="us-gaap_HealthCareMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ContainersMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContainersMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ContainersMember_lbl" xml:lang="en-US">Containers [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContainersMember" xlink:to="us-gaap_ContainersMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_SuperRetailMember" xlink:href="muzi-20260630.xsd#muzi_SuperRetailMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_SuperRetailMember_lbl" xml:lang="en-US">Super Retail [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SuperRetailMember" xlink:to="muzi_SuperRetailMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ConsumerProductsMember" xlink:href="muzi-20260630.xsd#muzi_ConsumerProductsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ConsumerProductsMember_lbl" xml:lang="en-US">Consumer Products [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ConsumerProductsMember" xlink:to="muzi_ConsumerProductsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_UtilitiesMember" xlink:href="muzi-20260630.xsd#muzi_UtilitiesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_UtilitiesMember_lbl" xml:lang="en-US">Utilities [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_UtilitiesMember" xlink:to="muzi_UtilitiesMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_EnergyMember" xlink:href="muzi-20260630.xsd#muzi_EnergyMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_EnergyMember_lbl" xml:lang="en-US">Energy [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EnergyMember" xlink:to="muzi_EnergyMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_TechnologyMember" xlink:href="muzi-20260630.xsd#muzi_TechnologyMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_TechnologyMember_lbl" xml:lang="en-US">Technology [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TechnologyMember" xlink:to="muzi_TechnologyMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AirlinesMember" xlink:href="muzi-20260630.xsd#muzi_AirlinesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AirlinesMember_lbl" xml:lang="en-US">Airlines [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AirlinesMember" xlink:to="muzi_AirlinesMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PublishingPrintingMember" xlink:href="muzi-20260630.xsd#muzi_PublishingPrintingMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PublishingPrintingMember_lbl" xml:lang="en-US">Publishing/Printing [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PublishingPrintingMember" xlink:to="muzi_PublishingPrintingMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ChemicalsMember" xlink:href="muzi-20260630.xsd#muzi_ChemicalsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ChemicalsMember_lbl" xml:lang="en-US">Chemicals [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ChemicalsMember" xlink:to="muzi_ChemicalsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_FoodBeverageTobaccoMember" xlink:href="muzi-20260630.xsd#muzi_FoodBeverageTobaccoMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_FoodBeverageTobaccoMember_lbl" xml:lang="en-US">Food/Beverage/Tobacco [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FoodBeverageTobaccoMember" xlink:to="muzi_FoodBeverageTobaccoMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_RailroadsMember" xlink:href="muzi-20260630.xsd#muzi_RailroadsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_RailroadsMember_lbl" xml:lang="en-US">Railroads [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RailroadsMember" xlink:to="muzi_RailroadsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_GamingMember" xlink:href="muzi-20260630.xsd#muzi_GamingMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_GamingMember_lbl" xml:lang="en-US">Gaming [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_GamingMember" xlink:to="muzi_GamingMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InsuranceMember" xlink:href="muzi-20260630.xsd#muzi_InsuranceMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InsuranceMember_lbl" xml:lang="en-US">Insurance [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InsuranceMember" xlink:to="muzi_InsuranceMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CapitalGoodsMember" xlink:href="muzi-20260630.xsd#muzi_CapitalGoodsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CapitalGoodsMember_lbl" xml:lang="en-US">Capital Goods [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CapitalGoodsMember" xlink:to="muzi_CapitalGoodsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_BroadcastingMember" xlink:href="muzi-20260630.xsd#muzi_BroadcastingMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_BroadcastingMember_lbl" xml:lang="en-US">Broadcasting [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_BroadcastingMember" xlink:to="muzi_BroadcastingMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_TelecommunicationsMember" xlink:href="muzi-20260630.xsd#muzi_TelecommunicationsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_TelecommunicationsMember_lbl" xml:lang="en-US">Telecommunications [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TelecommunicationsMember" xlink:to="muzi_TelecommunicationsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AutomotiveAutoPartsMember" xlink:href="muzi-20260630.xsd#muzi_AutomotiveAutoPartsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AutomotiveAutoPartsMember_lbl" xml:lang="en-US">Automotive &amp; Auto Parts	[Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAutoPartsMember" xlink:to="muzi_AutomotiveAutoPartsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MetalsMiningMember" xlink:href="muzi-20260630.xsd#muzi_MetalsMiningMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MetalsMiningMember_lbl" xml:lang="en-US">Metals/Mining [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MetalsMiningMember" xlink:to="muzi_MetalsMiningMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CableSatelliteTVMember" xlink:href="muzi-20260630.xsd#muzi_CableSatelliteTVMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CableSatelliteTVMember_lbl" xml:lang="en-US">Cable/Satellite TV [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CableSatelliteTVMember" xlink:to="muzi_CableSatelliteTVMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_TransportationInfrastructureMember" xlink:href="muzi-20260630.xsd#muzi_TransportationInfrastructureMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_TransportationInfrastructureMember_lbl" xml:lang="en-US">Transportation Infrastructure [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TransportationInfrastructureMember" xlink:to="muzi_TransportationInfrastructureMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CollaterisedDebtObligationMember" xlink:href="muzi-20260630.xsd#muzi_CollaterisedDebtObligationMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CollaterisedDebtObligationMember_lbl" xml:lang="en-US">Collateralized Debt Obligation [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CollaterisedDebtObligationMember" xlink:to="muzi_CollaterisedDebtObligationMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_SeniorSecuredLoanDebtInvestmentsMember" xlink:href="muzi-20260630.xsd#muzi_SeniorSecuredLoanDebtInvestmentsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_SeniorSecuredLoanDebtInvestmentsMember_lbl" xml:lang="en-US">Senior Secured Loan Debt Investments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInvestmentsMember" xlink:to="muzi_SeniorSecuredLoanDebtInvestmentsMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="muzi_SeniorSecuredLoanDebtInvestmentsMember_lbl0" xml:lang="en-US">Senior Secured Loan Debt Instruments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInvestmentsMember" xlink:to="muzi_SeniorSecuredLoanDebtInvestmentsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:label="muzi_SeniorSecuredLoanDebtInvestmentsMember_lbl1" xml:lang="en-US">Equity Investments &#8211; Preferred Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInvestmentsMember" xlink:to="muzi_SeniorSecuredLoanDebtInvestmentsMember_lbl1"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PreferredStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PreferredStockMember_lbl" xml:lang="en-US">Equity Investments - Preferred Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockMember" xlink:to="us-gaap_PreferredStockMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ShortTermInvestmentMoneyMarketFundsMember" xlink:href="muzi-20260630.xsd#muzi_ShortTermInvestmentMoneyMarketFundsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ShortTermInvestmentMoneyMarketFundsMember_lbl" xml:lang="en-US">Short Term Investment - Money Market Funds [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ShortTermInvestmentMoneyMarketFundsMember" xlink:to="muzi_ShortTermInvestmentMoneyMarketFundsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EstimateOfFairValueFairValueDisclosureMember_lbl" xml:lang="en-US">Fair Value Measurement [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:to="us-gaap_EstimateOfFairValueFairValueDisclosureMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueInputsLevel1Member" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xml:lang="en-US">Level 1 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel1Member" xlink:to="us-gaap_FairValueInputsLevel1Member_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueInputsLevel2Member" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xml:lang="en-US">Level 2 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel2Member" xlink:to="us-gaap_FairValueInputsLevel2Member_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueInputsLevel3Member" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xml:lang="en-US">Level 3 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel3Member" xlink:to="us-gaap_FairValueInputsLevel3Member_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_SeniorSecuredLoanDebtInstrumentsNonLiquidMember" xlink:href="muzi-20260630.xsd#muzi_SeniorSecuredLoanDebtInstrumentsNonLiquidMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_SeniorSecuredLoanDebtInstrumentsNonLiquidMember_lbl" xml:lang="en-US">Senior Secured Loan Debt Investments (Non-Liquid) [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInstrumentsNonLiquidMember" xlink:to="muzi_SeniorSecuredLoanDebtInstrumentsNonLiquidMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_SeniorSecuredLoanInvestmentsNonLiquidMember" xlink:href="muzi-20260630.xsd#muzi_SeniorSecuredLoanInvestmentsNonLiquidMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_SeniorSecuredLoanInvestmentsNonLiquidMember_lbl" xml:lang="en-US">Senior Secured Loan Investments (Non-Liquid) [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanInvestmentsNonLiquidMember" xlink:to="muzi_SeniorSecuredLoanInvestmentsNonLiquidMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_SeniorSecuredLoanDebtInvestmentsNonLiquidTwoMember" xlink:href="muzi-20260630.xsd#muzi_SeniorSecuredLoanDebtInvestmentsNonLiquidTwoMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_SeniorSecuredLoanDebtInvestmentsNonLiquidTwoMember_lbl" xml:lang="en-US">Senior Secured Loan Debt Investments (Non-Liquid) [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInvestmentsNonLiquidTwoMember" xlink:to="muzi_SeniorSecuredLoanDebtInvestmentsNonLiquidTwoMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_EquityInvestmentsPreferredStockOneMember" xlink:href="muzi-20260630.xsd#muzi_EquityInvestmentsPreferredStockOneMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_EquityInvestmentsPreferredStockOneMember_lbl" xml:lang="en-US">Equity Investments - Preferred Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsPreferredStockOneMember" xlink:to="muzi_EquityInvestmentsPreferredStockOneMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_EquityInvestmentsWarrantsMember" xlink:href="muzi-20260630.xsd#muzi_EquityInvestmentsWarrantsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_EquityInvestmentsWarrantsMember_lbl" xml:lang="en-US">Equity Investments - Warrants [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsWarrantsMember" xlink:to="muzi_EquityInvestmentsWarrantsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="srt_MinimumMember" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="srt_MinimumMember_lbl" xml:lang="en-US">Minimum [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MinimumMember" xlink:to="srt_MinimumMember_lbl"/>
    <loc xlink:type="locator" xlink:label="srt_MaximumMember" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="srt_MaximumMember_lbl" xml:lang="en-US">Maximum [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MaximumMember" xlink:to="srt_MaximumMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AprilOneTwoZeroTwoSixMember" xlink:href="muzi-20260630.xsd#muzi_AprilOneTwoZeroTwoSixMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AprilOneTwoZeroTwoSixMember_lbl" xml:lang="en-US">April 1, 2026 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AprilOneTwoZeroTwoSixMember" xlink:to="muzi_AprilOneTwoZeroTwoSixMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_JanuaryTwoTwoZeroTwoFiveMember" xlink:href="muzi-20260630.xsd#muzi_JanuaryTwoTwoZeroTwoFiveMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_JanuaryTwoTwoZeroTwoFiveMember_lbl" xml:lang="en-US">January 2, 2025 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_JanuaryTwoTwoZeroTwoFiveMember" xlink:to="muzi_JanuaryTwoTwoZeroTwoFiveMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DecemberTwentySevenTwoZeroTwoFiveMember" xlink:href="muzi-20260630.xsd#muzi_DecemberTwentySevenTwoZeroTwoFiveMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DecemberTwentySevenTwoZeroTwoFiveMember_lbl" xml:lang="en-US">December 27, 2025 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DecemberTwentySevenTwoZeroTwoFiveMember" xlink:to="muzi_DecemberTwentySevenTwoZeroTwoFiveMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DecemberTwentySevenTwoZeroTwoFourMember" xlink:href="muzi-20260630.xsd#muzi_DecemberTwentySevenTwoZeroTwoFourMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DecemberTwentySevenTwoZeroTwoFourMember_lbl" xml:lang="en-US">December 27, 2024 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DecemberTwentySevenTwoZeroTwoFourMember" xlink:to="muzi_DecemberTwentySevenTwoZeroTwoFourMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionAxis_lbl" xml:lang="en-US">Related Party Transaction [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionAxis" xlink:to="us-gaap_RelatedPartyTransactionAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TypeOfArrangementAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TypeOfArrangementAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TypeOfArrangementAxis_lbl" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TypeOfArrangementAxis" xlink:to="us-gaap_TypeOfArrangementAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="srt_StatementGeographicalAxis" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_StatementGeographicalAxis_lbl" xml:lang="en-US">Geographical [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_StatementGeographicalAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventTypeAxis_lbl" xml:lang="en-US">Subsequent Event Type [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LongtermDebtTypeAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongtermDebtTypeAxis_lbl" xml:lang="en-US">Long-Term Debt, Type [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="ecd_Rule10b51ArrAdoptedFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_Rule10b51ArrAdoptedFlag"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ecd_Rule10b51ArrAdoptedFlag_lbl" xml:lang="en-US">Rule 10b5-1 Arrangement Adopted [Flag]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_Rule10b51ArrAdoptedFlag" xlink:to="ecd_Rule10b51ArrAdoptedFlag_lbl"/>
    <loc xlink:type="locator" xlink:label="ecd_NonRule10b51ArrAdoptedFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_NonRule10b51ArrAdoptedFlag"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ecd_NonRule10b51ArrAdoptedFlag_lbl" xml:lang="en-US">Non-Rule 10b5-1 Arrangement Adopted [Flag]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_NonRule10b51ArrAdoptedFlag" xlink:to="ecd_NonRule10b51ArrAdoptedFlag_lbl"/>
    <loc xlink:type="locator" xlink:label="ecd_Rule10b51ArrTrmntdFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_Rule10b51ArrTrmntdFlag"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ecd_Rule10b51ArrTrmntdFlag_lbl" xml:lang="en-US">Rule 10b5-1 Arrangement Terminated [Flag]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_Rule10b51ArrTrmntdFlag" xlink:to="ecd_Rule10b51ArrTrmntdFlag_lbl"/>
    <loc xlink:type="locator" xlink:label="ecd_NonRule10b51ArrTrmntdFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_NonRule10b51ArrTrmntdFlag"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ecd_NonRule10b51ArrTrmntdFlag_lbl" xml:lang="en-US">Non-Rule 10b5-1 Arrangement Terminated [Flag]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_NonRule10b51ArrTrmntdFlag" xlink:to="ecd_NonRule10b51ArrTrmntdFlag_lbl"/>
    <loc xlink:type="locator" xlink:label="ecd_InsiderTrdPoliciesProcAdoptedFlag" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_InsiderTrdPoliciesProcAdoptedFlag"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ecd_InsiderTrdPoliciesProcAdoptedFlag_lbl" xml:lang="en-US">Insider Trading Policies and Procedures Adopted [Flag]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_InsiderTrdPoliciesProcAdoptedFlag" xlink:to="ecd_InsiderTrdPoliciesProcAdoptedFlag_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentInterestRatePaidInCash" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInterestRatePaidInCash"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentInterestRatePaidInCash_lbl" xml:lang="en-US">Investment rate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentInterestRatePaidInCash" xlink:to="us-gaap_InvestmentInterestRatePaidInCash_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_Cash" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Cash"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_Cash_lbl" xml:lang="en-US">Cash (in Dollars)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Cash" xlink:to="us-gaap_Cash_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PercentageOfTotalAssets" xlink:href="muzi-20260630.xsd#muzi_PercentageOfTotalAssets"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PercentageOfTotalAssets_lbl" xml:lang="en-US">Percentage of total assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfTotalAssets" xlink:to="muzi_PercentageOfTotalAssets_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MarketCapitalization" xlink:href="muzi-20260630.xsd#muzi_MarketCapitalization"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MarketCapitalization_lbl" xml:lang="en-US">Market capitalization (in Dollars)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MarketCapitalization" xlink:to="muzi_MarketCapitalization_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription_lbl" xml:lang="en-US">Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription" xlink:to="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NumberOfOperatingSegments" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfOperatingSegments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NumberOfOperatingSegments_lbl" xml:lang="en-US">Operating segment (in Segment)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NumberOfOperatingSegments" xlink:to="us-gaap_NumberOfOperatingSegments_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NumberOfReportableSegments" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NumberOfReportableSegments_lbl" xml:lang="en-US">Reportable segment (in Segment)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NumberOfReportableSegments" xlink:to="us-gaap_NumberOfReportableSegments_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration_lbl" xml:lang="en-US">Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration" xlink:to="us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossRatio" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyInvestmentIncomeLossRatio"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossRatio_lbl" xml:lang="en-US">Investment company taxable income percentage</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyInvestmentIncomeLossRatio" xlink:to="us-gaap_InvestmentCompanyInvestmentIncomeLossRatio_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PercentageOfNondeductibleUSFederalExciseTax" xlink:href="muzi-20260630.xsd#muzi_PercentageOfNondeductibleUSFederalExciseTax"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PercentageOfNondeductibleUSFederalExciseTax_lbl" xml:lang="en-US">Percentage of nondeductible U.S. federal excise tax</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfNondeductibleUSFederalExciseTax" xlink:to="muzi_PercentageOfNondeductibleUSFederalExciseTax_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PercentageOfNetOrdinaryIncome" xlink:href="muzi-20260630.xsd#muzi_PercentageOfNetOrdinaryIncome"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PercentageOfNetOrdinaryIncome_lbl" xml:lang="en-US">Percentage of net ordinary income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfNetOrdinaryIncome" xlink:to="muzi_PercentageOfNetOrdinaryIncome_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses" xlink:href="muzi-20260630.xsd#muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses_lbl" xml:lang="en-US">Percentage of capital gains in excess of capital losses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses" xlink:to="muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PercentageOfCarryForwardTaxableIncome" xlink:href="muzi-20260630.xsd#muzi_PercentageOfCarryForwardTaxableIncome"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PercentageOfCarryForwardTaxableIncome_lbl" xml:lang="en-US">Percentage of carry forward taxable income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfCarryForwardTaxableIncome" xlink:to="muzi_PercentageOfCarryForwardTaxableIncome_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AnnualManagementBaseRateFee" xlink:href="muzi-20260630.xsd#muzi_AnnualManagementBaseRateFee"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AnnualManagementBaseRateFee_lbl" xml:lang="en-US">Annual management fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AnnualManagementBaseRateFee" xlink:to="muzi_AnnualManagementBaseRateFee_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PaymentForManagementFee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentForManagementFee"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PaymentForManagementFee_lbl" xml:lang="en-US">Base management fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentForManagementFee" xlink:to="us-gaap_PaymentForManagementFee_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AmountOfAdviserVoluntarilyWaived" xlink:href="muzi-20260630.xsd#muzi_AmountOfAdviserVoluntarilyWaived"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AmountOfAdviserVoluntarilyWaived_lbl" xml:lang="en-US">Amount of adviser voluntarily waived</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AmountOfAdviserVoluntarilyWaived" xlink:to="muzi_AmountOfAdviserVoluntarilyWaived_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyIncentiveFeeToAverageNetAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyIncentiveFeeToAverageNetAssets"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyIncentiveFeeToAverageNetAssets_lbl" xml:lang="en-US">Pre-incentive fee net investment income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyIncentiveFeeToAverageNetAssets" xlink:to="us-gaap_InvestmentCompanyIncentiveFeeToAverageNetAssets_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncentiveFeeDescription" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncentiveFeeDescription"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncentiveFeeDescription_lbl" xml:lang="en-US">Incentive fee, description</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncentiveFeeDescription" xlink:to="us-gaap_IncentiveFeeDescription_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_RealizedCapitalGainsPercentage" xlink:href="muzi-20260630.xsd#muzi_RealizedCapitalGainsPercentage"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_RealizedCapitalGainsPercentage_lbl" xml:lang="en-US">Realized capital gains percentage</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RealizedCapitalGainsPercentage" xlink:to="muzi_RealizedCapitalGainsPercentage_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ManagementAndIncentiveFeesExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementAndIncentiveFeesExpense"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ManagementAndIncentiveFeesExpense_lbl" xml:lang="en-US">Incentive fee</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ManagementAndIncentiveFeesExpense" xlink:to="us-gaap_ManagementAndIncentiveFeesExpense_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IncurredFees" xlink:href="muzi-20260630.xsd#muzi_IncurredFees"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IncurredFees_lbl" xml:lang="en-US">Incurred fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncurredFees" xlink:to="muzi_IncurredFees_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_OrganizationalAndOfferingFeesPayable" xlink:href="muzi-20260630.xsd#muzi_OrganizationalAndOfferingFeesPayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_OrganizationalAndOfferingFeesPayable_lbl" xml:lang="en-US">Total organizational and offering fees incurred</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OrganizationalAndOfferingFeesPayable" xlink:to="muzi_OrganizationalAndOfferingFeesPayable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyExcessExpenseReimbursable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyExcessExpenseReimbursable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyExcessExpenseReimbursable_lbl" xml:lang="en-US">Total costs of reimbursable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyExcessExpenseReimbursable" xlink:to="us-gaap_InvestmentCompanyExcessExpenseReimbursable_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_OutstandingSharesPercentage" xlink:href="muzi-20260630.xsd#muzi_OutstandingSharesPercentage"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_OutstandingSharesPercentage_lbl" xml:lang="en-US">Percentage of outstanding shares of common stock</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OutstandingSharesPercentage" xlink:to="muzi_OutstandingSharesPercentage_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PercentageOfOutstandingVotingSecurities" xlink:href="muzi-20260630.xsd#muzi_PercentageOfOutstandingVotingSecurities"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PercentageOfOutstandingVotingSecurities_lbl" xml:lang="en-US">Percentage of outstanding voting securities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfOutstandingVotingSecurities" xlink:to="muzi_PercentageOfOutstandingVotingSecurities_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentsInNumberOfPortfolioCompanies" xlink:href="muzi-20260630.xsd#muzi_InvestmentsInNumberOfPortfolioCompanies"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentsInNumberOfPortfolioCompanies_lbl" xml:lang="en-US">Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentsInNumberOfPortfolioCompanies" xlink:to="muzi_InvestmentsInNumberOfPortfolioCompanies_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DebtInstrumentFaceAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl" xml:lang="en-US">Loan cost</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentFaceAmount" xlink:to="us-gaap_DebtInstrumentFaceAmount_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl" xml:lang="en-US">Purchase common stock</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:to="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockDividendsPerShareDeclared" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockDividendsPerShareDeclared_lbl" xml:lang="en-US">Distribution per share (in Dollars per share)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockDividendsPerShareDeclared" xlink:to="us-gaap_CommonStockDividendsPerShareDeclared_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DividendsPayableCurrentAndNoncurrent_lbl" xml:lang="en-US">Distributions payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:to="us-gaap_DividendsPayableCurrentAndNoncurrent_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock_lbl" xml:lang="en-US">Basis of Presentation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:to="us-gaap_BasisOfAccountingPolicyPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ConsolidationPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsolidationPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ConsolidationPolicyTextBlock_lbl" xml:lang="en-US">Basis of Consolidation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConsolidationPolicyTextBlock" xlink:to="us-gaap_ConsolidationPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_UseOfEstimates" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UseOfEstimates"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_UseOfEstimates_lbl" xml:lang="en-US">Use of Estimates</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UseOfEstimates" xlink:to="us-gaap_UseOfEstimates_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl" xml:lang="en-US">Cash and Cash Equivalents</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:to="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PrincipalPaydownsPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_PrincipalPaydownsPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PrincipalPaydownsPolicyTextBlock_lbl" xml:lang="en-US">Principal Paydowns</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PrincipalPaydownsPolicyTextBlock" xlink:to="muzi_PrincipalPaydownsPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_OfferingCostsPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_OfferingCostsPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_OfferingCostsPolicyTextBlock_lbl" xml:lang="en-US">Offering Costs</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OfferingCostsPolicyTextBlock" xlink:to="muzi_OfferingCostsPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CompanyCommonStockShareValuationPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_CompanyCommonStockShareValuationPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CompanyCommonStockShareValuationPolicyTextBlock_lbl" xml:lang="en-US">Company Common Stock Share Valuation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CompanyCommonStockShareValuationPolicyTextBlock" xlink:to="muzi_CompanyCommonStockShareValuationPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentPolicyTextBlock_lbl" xml:lang="en-US">Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentPolicyTextBlock" xlink:to="us-gaap_InvestmentPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock_lbl" xml:lang="en-US">Valuation of Portfolio Securities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock" xlink:to="muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock_lbl" xml:lang="en-US">Net Realized Gains or Losses and Net Change in Unrealized Appreciation or Depreciation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock" xlink:to="muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock_lbl" xml:lang="en-US">Interest and Dividend Income Recognition</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock" xlink:to="muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PaymentinKindInterestPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_PaymentinKindInterestPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PaymentinKindInterestPolicyTextBlock_lbl" xml:lang="en-US">Payment-in-Kind (&#8220;PIK&#8221;) Interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PaymentinKindInterestPolicyTextBlock" xlink:to="muzi_PaymentinKindInterestPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_OtherIncomePolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_OtherIncomePolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_OtherIncomePolicyTextBlock_lbl" xml:lang="en-US">Other Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OtherIncomePolicyTextBlock" xlink:to="muzi_OtherIncomePolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DealOriginationCostsPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_DealOriginationCostsPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DealOriginationCostsPolicyTextBlock_lbl" xml:lang="en-US">Deal Origination Costs</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DealOriginationCostsPolicyTextBlock" xlink:to="muzi_DealOriginationCostsPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DistributionsToStockholdersPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_DistributionsToStockholdersPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DistributionsToStockholdersPolicyTextBlock_lbl" xml:lang="en-US">Distributions to Stockholders</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionsToStockholdersPolicyTextBlock" xlink:to="muzi_DistributionsToStockholdersPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock_lbl" xml:lang="en-US">Identification of Non-Accrual Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock" xlink:to="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_lbl" xml:lang="en-US">Foreign Security and Currency Translations</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:to="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock_lbl" xml:lang="en-US">Correction of Prior Period Presentation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock" xlink:to="muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingPolicyPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl" xml:lang="en-US">Segment Reporting</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:to="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xml:lang="en-US">Recently Issued and Adopted Accounting Pronouncements</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:to="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xml:lang="en-US">Taxation as a RIC</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxPolicyTextBlock" xlink:to="us-gaap_IncomeTaxPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyDistributionPolicyTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyDistributionPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyDistributionPolicyTextBlock_lbl" xml:lang="en-US">Distributions and Components of Net Assets on a Tax Basis</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributionPolicyTextBlock" xlink:to="us-gaap_InvestmentCompanyDistributionPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommonStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommonStockMember_lbl" xml:lang="en-US">Common Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockMember" xlink:to="us-gaap_CommonStockMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentAdvisoryAgreementMember" xlink:href="muzi-20260630.xsd#muzi_InvestmentAdvisoryAgreementMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentAdvisoryAgreementMember_lbl" xml:lang="en-US">Investment Advisory Agreement [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentAdvisoryAgreementMember" xlink:to="muzi_InvestmentAdvisoryAgreementMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PerQuarterMember" xlink:href="muzi-20260630.xsd#muzi_PerQuarterMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PerQuarterMember_lbl" xml:lang="en-US">Quarter Rate [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PerQuarterMember" xlink:to="muzi_PerQuarterMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RelatedPartyMember_lbl" xml:lang="en-US">Related Party [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyMember" xlink:to="us-gaap_RelatedPartyMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AdministrationAgreementMember" xlink:href="muzi-20260630.xsd#muzi_AdministrationAgreementMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AdministrationAgreementMember_lbl" xml:lang="en-US">Administration Agreement [Member[</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AdministrationAgreementMember" xlink:to="muzi_AdministrationAgreementMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_FundAccountingAgreementMember" xlink:href="muzi-20260630.xsd#muzi_FundAccountingAgreementMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_FundAccountingAgreementMember_lbl" xml:lang="en-US">Fund Accounting Agreement [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FundAccountingAgreementMember" xlink:to="muzi_FundAccountingAgreementMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PlacementAgentAgreementMember" xlink:href="muzi-20260630.xsd#muzi_PlacementAgentAgreementMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PlacementAgentAgreementMember_lbl" xml:lang="en-US">Placement Agent Agreement [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PlacementAgentAgreementMember" xlink:to="muzi_PlacementAgentAgreementMember_lbl"/>
    <loc xlink:type="locator" xlink:label="country_US" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="country_US_lbl" xml:lang="en-US">United States [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="country_US" xlink:to="country_US_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AaristaLLCMember" xlink:href="muzi-20260630.xsd#muzi_AaristaLLCMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AaristaLLCMember_lbl" xml:lang="en-US">Aarista, LLC [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AaristaLLCMember" xlink:to="muzi_AaristaLLCMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SubsequentEventMember_lbl" xml:lang="en-US">Subsequent Event [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventMember" xlink:to="us-gaap_SubsequentEventMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_VLNCInfrastructureIncMember" xlink:href="muzi-20260630.xsd#muzi_VLNCInfrastructureIncMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_VLNCInfrastructureIncMember_lbl" xml:lang="en-US">VLNC Infrastructure Inc [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_VLNCInfrastructureIncMember" xlink:to="muzi_VLNCInfrastructureIncMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PrimeTimeSpecialtyVehicleLLCMember" xlink:href="muzi-20260630.xsd#muzi_PrimeTimeSpecialtyVehicleLLCMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PrimeTimeSpecialtyVehicleLLCMember_lbl" xml:lang="en-US">Prime-Time Specialty Vehicle, LLC [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PrimeTimeSpecialtyVehicleLLCMember" xlink:to="muzi_PrimeTimeSpecialtyVehicleLLCMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_TermLoanMember" xlink:href="muzi-20260630.xsd#muzi_TermLoanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_TermLoanMember_lbl" xml:lang="en-US">Term Loan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TermLoanMember" xlink:to="muzi_TermLoanMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementTable_lbl" xml:lang="en-US">Statement [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementLineItems_lbl" xml:lang="en-US">Statement [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DistributionRecordDateDomainDomain" xlink:href="muzi-20260630.xsd#muzi_DistributionRecordDateDomainDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DistributionRecordDateDomainDomain_lbl" xml:lang="en-US">DistributionRecordDateDomain [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionRecordDateDomainDomain" xlink:to="muzi_DistributionRecordDateDomainDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionTypeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionTypeDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionTypeDomain_lbl" xml:lang="en-US">Distribution Type [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionTypeDomain" xlink:to="us-gaap_DistributionTypeDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLLCMemberTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionsMadeToLimitedLiabilityCompanyLLCMemberTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLLCMemberTable_lbl" xml:lang="en-US">Distributions Made to Limited Liability Company (LLC) Member [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLLCMemberTable" xlink:to="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLLCMemberTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberLineItems_lbl" xml:lang="en-US">Schedule of Distributions Declared [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberLineItems" xlink:to="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherCommitmentsDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherCommitmentsDomain_lbl" xml:lang="en-US">Other Commitments [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherCommitmentsDomain" xlink:to="us-gaap_OtherCommitmentsDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherCommitmentsTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherCommitmentsTable_lbl" xml:lang="en-US">Other Commitments [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherCommitmentsTable" xlink:to="us-gaap_OtherCommitmentsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherCommitmentsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherCommitmentsLineItems_lbl" xml:lang="en-US">Schedule of Unfunded Commitments to Provide Debt Financing [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherCommitmentsLineItems" xlink:to="us-gaap_OtherCommitmentsLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentTypeCategorizationMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentTypeCategorizationMember_lbl" xml:lang="en-US">Investments [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="us-gaap_InvestmentTypeCategorizationMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LocationStatementsOfFinancialPositionBalanceDomainDomain" xlink:href="muzi-20260630.xsd#muzi_LocationStatementsOfFinancialPositionBalanceDomainDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_LocationStatementsOfFinancialPositionBalanceDomainDomain_lbl" xml:lang="en-US">LocationStatementsOfFinancialPositionBalanceDomain [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LocationStatementsOfFinancialPositionBalanceDomainDomain" xlink:to="muzi_LocationStatementsOfFinancialPositionBalanceDomainDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentsScheduleofInvestmentPortfolioatAmortizedCostandFairValueDetailsTable" xlink:href="muzi-20260630.xsd#muzi_InvestmentsScheduleofInvestmentPortfolioatAmortizedCostandFairValueDetailsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentsScheduleofInvestmentPortfolioatAmortizedCostandFairValueDetailsTable_lbl" xml:lang="en-US">Investments - Schedule of Investment Portfolio at Amortized Cost and Fair Value (Details) [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentsScheduleofInvestmentPortfolioatAmortizedCostandFairValueDetailsTable" xlink:to="muzi_InvestmentsScheduleofInvestmentPortfolioatAmortizedCostandFairValueDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SummaryOfInvestmentHoldingsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SummaryOfInvestmentHoldingsLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SummaryOfInvestmentHoldingsLineItems_lbl" xml:lang="en-US">Schedule of Investment Portfolio at Amortized Cost and Fair Value [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SummaryOfInvestmentHoldingsLineItems" xlink:to="us-gaap_SummaryOfInvestmentHoldingsLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquitySecuritiesIndustryMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesIndustryMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquitySecuritiesIndustryMember_lbl" xml:lang="en-US">Industry Sector [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="us-gaap_EquitySecuritiesIndustryMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyChangesInNetAssetsTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyChangesInNetAssetsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyChangesInNetAssetsTable_lbl" xml:lang="en-US">Investment Company, Change in Net Assets [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyChangesInNetAssetsTable" xlink:to="us-gaap_InvestmentCompanyChangesInNetAssetsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyChangesInNetAssetsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyChangesInNetAssetsLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyChangesInNetAssetsLineItems_lbl" xml:lang="en-US">Schedule of Investments Based on Fair Value, as a Percentage of Net Assets [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyChangesInNetAssetsLineItems" xlink:to="us-gaap_InvestmentCompanyChangesInNetAssetsLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_lbl" xml:lang="en-US">Financial Instruments [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xml:lang="en-US">Fair Value Hierarchy and NAV [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_FairValueofInvestmentsScheduleofFairValueHierarchyDetailsTable" xlink:href="muzi-20260630.xsd#muzi_FairValueofInvestmentsScheduleofFairValueHierarchyDetailsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_FairValueofInvestmentsScheduleofFairValueHierarchyDetailsTable_lbl" xml:lang="en-US">Fair Value of Investments - Schedule of Fair Value Hierarchy (Details) [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueofInvestmentsScheduleofFairValueHierarchyDetailsTable" xlink:to="muzi_FairValueofInvestmentsScheduleofFairValueHierarchyDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl" xml:lang="en-US">Schedule of Fair Value Hierarchy [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_FairValueofInvestmentsScheduleofChangesintheFairValueofInvestmentsDetailsTable" xlink:href="muzi-20260630.xsd#muzi_FairValueofInvestmentsScheduleofChangesintheFairValueofInvestmentsDetailsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_FairValueofInvestmentsScheduleofChangesintheFairValueofInvestmentsDetailsTable_lbl" xml:lang="en-US">Fair Value of Investments - Schedule of Changes in the Fair Value of Investments (Details) [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueofInvestmentsScheduleofChangesintheFairValueofInvestmentsDetailsTable" xlink:to="muzi_FairValueofInvestmentsScheduleofChangesintheFairValueofInvestmentsDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueOptionQuantitativeDisclosuresLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_lbl" xml:lang="en-US">Schedule of Changes in the Fair Value of Investments [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueOptionQuantitativeDisclosuresLineItems" xlink:to="us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_FairValueofInvestmentsScheduleofNetChangeinUnrealizedAppreciationDepreciationDetailsTable" xlink:href="muzi-20260630.xsd#muzi_FairValueofInvestmentsScheduleofNetChangeinUnrealizedAppreciationDepreciationDetailsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_FairValueofInvestmentsScheduleofNetChangeinUnrealizedAppreciationDepreciationDetailsTable_lbl" xml:lang="en-US">Fair Value of Investments - Schedule of Net Change in Unrealized Appreciation (Depreciation) (Details) [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueofInvestmentsScheduleofNetChangeinUnrealizedAppreciationDepreciationDetailsTable" xlink:to="muzi_FairValueofInvestmentsScheduleofNetChangeinUnrealizedAppreciationDepreciationDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_lbl" xml:lang="en-US">Schedule of Net Change in Unrealized Appreciation (Depreciation) [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems" xlink:to="us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="srt_RangeMember" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_RangeMember_lbl" xml:lang="en-US">Statistical Measurement [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_RangeMember" xlink:to="srt_RangeMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_lbl" xml:lang="en-US">Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_lbl" xml:lang="en-US">Schedule of Information about Significant Unobservable Inputs of Investments [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AwardDateDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardDateDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AwardDateDomain_lbl" xml:lang="en-US">Award Date [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AwardDateDomain" xlink:to="us-gaap_AwardDateDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetAssetsScheduleofCommonStockIssuancesDetailsTable" xlink:href="muzi-20260630.xsd#muzi_NetAssetsScheduleofCommonStockIssuancesDetailsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetAssetsScheduleofCommonStockIssuancesDetailsTable_lbl" xml:lang="en-US">Net Assets - Schedule of Common Stock Issuances (Details) [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAssetsScheduleofCommonStockIssuancesDetailsTable" xlink:to="muzi_NetAssetsScheduleofCommonStockIssuancesDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EquityClassOfTreasuryStockLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquityClassOfTreasuryStockLineItems_lbl" xml:lang="en-US">Schedule of Common Stock Issuances [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquityClassOfTreasuryStockLineItems" xlink:to="us-gaap_EquityClassOfTreasuryStockLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfIncentiveDistributionMadeToManagingMemberOrGeneralPartnerTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfIncentiveDistributionMadeToManagingMemberOrGeneralPartnerTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfIncentiveDistributionMadeToManagingMemberOrGeneralPartnerTable_lbl" xml:lang="en-US">Partners&apos; Capital, Managing Member or General Partner, Incentive Distribution [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfIncentiveDistributionMadeToManagingMemberOrGeneralPartnerTable" xlink:to="us-gaap_ScheduleOfIncentiveDistributionMadeToManagingMemberOrGeneralPartnerTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerLineItems_lbl" xml:lang="en-US">Schedule of Company Declared Distributions [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerLineItems" xlink:to="us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetAssetsScheduleofSharesIssuedDetailsTable" xlink:href="muzi-20260630.xsd#muzi_NetAssetsScheduleofSharesIssuedDetailsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetAssetsScheduleofSharesIssuedDetailsTable_lbl" xml:lang="en-US">Net Assets - Schedule of Shares Issued (Details) [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAssetsScheduleofSharesIssuedDetailsTable" xlink:to="muzi_NetAssetsScheduleofSharesIssuedDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentHoldingsOtherThanSecuritiesLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentHoldingsOtherThanSecuritiesLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentHoldingsOtherThanSecuritiesLineItems_lbl" xml:lang="en-US">Schedule of Shares Issued [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentHoldingsOtherThanSecuritiesLineItems" xlink:to="us-gaap_InvestmentHoldingsOtherThanSecuritiesLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialHighlightsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsTable_lbl" xml:lang="en-US">Investment Company, Financial Highlights [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyFinancialHighlightsTable" xlink:to="us-gaap_InvestmentCompanyFinancialHighlightsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyFinancialHighlightsLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsLineItems_lbl" xml:lang="en-US">Schedule of Consolidated Financial Highlights [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyFinancialHighlightsLineItems" xlink:to="us-gaap_InvestmentCompanyFinancialHighlightsLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfStockDomain_lbl" xml:lang="en-US">Class of Stock [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_ClassOfStockDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_OrganizationDetailsTable" xlink:href="muzi-20260630.xsd#muzi_OrganizationDetailsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_OrganizationDetailsTable_lbl" xml:lang="en-US">Organization (Details) [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OrganizationDetailsTable" xlink:to="muzi_OrganizationDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xml:lang="en-US">Organization [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ClassOfStockLineItems" xlink:to="us-gaap_ClassOfStockLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember_lbl" xml:lang="en-US">Collaborative Arrangement and Arrangement Other than Collaborative [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:to="us-gaap_ArrangementsAndNonarrangementTransactionsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionDomain_lbl" xml:lang="en-US">Related Party Transaction [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionDomain" xlink:to="us-gaap_RelatedPartyTransactionDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_RelatedPartyTransactionsDetailsTable" xlink:href="muzi-20260630.xsd#muzi_RelatedPartyTransactionsDetailsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_RelatedPartyTransactionsDetailsTable_lbl" xml:lang="en-US">Related Party Transactions (Details) [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RelatedPartyTransactionsDetailsTable" xlink:to="muzi_RelatedPartyTransactionsDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionLineItems_lbl" xml:lang="en-US">Related Party Transactions [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="us-gaap_RelatedPartyTransactionLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="srt_SegmentGeographicalDomain" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_SegmentGeographicalDomain_lbl" xml:lang="en-US">Geographical [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_SegmentGeographicalDomain" xlink:to="srt_SegmentGeographicalDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentsDetailsTable" xlink:href="muzi-20260630.xsd#muzi_InvestmentsDetailsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentsDetailsTable_lbl" xml:lang="en-US">Investments (Details) [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentsDetailsTable" xlink:to="muzi_InvestmentsDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_lbl" xml:lang="en-US">Investments [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" xlink:to="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xml:lang="en-US">Subsequent Event Type [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventTypeDomain" xlink:to="us-gaap_SubsequentEventTypeDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DebtInstrumentNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentNameDomain_lbl" xml:lang="en-US">Debt Instrument, Name [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="us-gaap_DebtInstrumentNameDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LongtermDebtTypeDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LongtermDebtTypeDomain_lbl" xml:lang="en-US">Long-Term Debt, Type [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="us-gaap_LongtermDebtTypeDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_SubsequentEventsDetailsTable" xlink:href="muzi-20260630.xsd#muzi_SubsequentEventsDetailsTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_SubsequentEventsDetailsTable_lbl" xml:lang="en-US">Subsequent Events (Details) [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SubsequentEventsDetailsTable" xlink:to="muzi_SubsequentEventsDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventLineItems_lbl" xml:lang="en-US">Subsequent Events [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventLineItems" xlink:to="us-gaap_SubsequentEventLineItems_lbl"/>
    <loc xlink:type="locator" xlink:label="ecd_TradingArrByIndTable" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_TradingArrByIndTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_TradingArrByIndTable_lbl" xml:lang="en-US">Trading Arrangements, by Individual [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_TradingArrByIndTable" xlink:to="ecd_TradingArrByIndTable_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_AccruedOtherGeneralAndAdministrativeExpenses_lbl0" xml:lang="en-US">The amount of accrued other general and administrative expenses.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AccruedOtherGeneralAndAdministrativeExpenses" xlink:to="muzi_AccruedOtherGeneralAndAdministrativeExpenses_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_AcquisitionDate_lbl0" xml:lang="en-US">Acquisition date.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AcquisitionDate" xlink:to="muzi_AcquisitionDate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences_lbl0" xml:lang="en-US">Amount of additional paid-in capital permanent book tax differnce.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences" xlink:to="muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_AmountOfAdviserVoluntarilyWaived_lbl0" xml:lang="en-US">Amount of adviser voluntarily waived.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AmountOfAdviserVoluntarilyWaived" xlink:to="muzi_AmountOfAdviserVoluntarilyWaived_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_AnnualManagementBaseRateFee_lbl0" xml:lang="en-US">Represent the annual management base rate fees.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AnnualManagementBaseRateFee" xlink:to="muzi_AnnualManagementBaseRateFee_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_CompanyCommonStockShareValuationPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of company common stock share valuation.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CompanyCommonStockShareValuationPolicyTextBlock" xlink:to="muzi_CompanyCommonStockShareValuationPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock_lbl0" xml:lang="en-US">The accounting policy for correction of Prior Period Presentation.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock" xlink:to="muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_DealOriginationCostsPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policies for deal origination costs.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DealOriginationCostsPolicyTextBlock" xlink:to="muzi_DealOriginationCostsPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_DistributionsReinvested_lbl0" xml:lang="en-US">Distributions reinvested.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionsReinvested" xlink:to="muzi_DistributionsReinvested_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_DistributionsToStockholdersPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policies for distributions to stockholders.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionsToStockholdersPolicyTextBlock" xlink:to="muzi_DistributionsToStockholdersPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_DividendsPayableAmount_lbl0" xml:lang="en-US">The per share amount of a dividend declared, but not paid, as of the financial reporting date.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DividendsPayableAmount" xlink:to="muzi_DividendsPayableAmount_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_FairValueSignificantUnobservableRangeInput_lbl0" xml:lang="en-US">Represent the fair value significant unobservable range input.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueSignificantUnobservableRangeInput" xlink:to="muzi_FairValueSignificantUnobservableRangeInput_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policy for identification of non-accrual investments.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock" xlink:to="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses_lbl0" xml:lang="en-US">Accrued other general and administrative expenses.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses" xlink:to="muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_IncreaseDecreaseInDirectorsFeesPayable_lbl0" xml:lang="en-US">Directors&#8217; fees payable.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInDirectorsFeesPayable" xlink:to="muzi_IncreaseDecreaseInDirectorsFeesPayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable_lbl0" xml:lang="en-US">Organizational and offering fees payable.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable" xlink:to="muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_IncreaseDecreaseInProfessionalFeesPayable_lbl0" xml:lang="en-US">Amount of increase (decrease) in professional fees payable.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInProfessionalFeesPayable" xlink:to="muzi_IncreaseDecreaseInProfessionalFeesPayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_IncurredFees_lbl0" xml:lang="en-US">Amount of Incurred fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncurredFees" xlink:to="muzi_IncurredFees_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock_lbl0" xml:lang="en-US">Interest and dividend income recognition.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock" xlink:to="muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm_lbl0" xml:lang="en-US">Amount of accumulated undistributed earnings (deficit) from short-term capital gain (loss) of investment company.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm" xlink:to="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique_lbl0" xml:lang="en-US">Description of valuation technique.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique" xlink:to="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentCompanySpreadAboveIndex_lbl0" xml:lang="en-US">It represent spread above index.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanySpreadAboveIndex" xlink:to="muzi_InvestmentCompanySpreadAboveIndex_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentsInNumberOfPortfolioCompanies_lbl0" xml:lang="en-US">Investments in number of portfolio companies.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentsInNumberOfPortfolioCompanies" xlink:to="muzi_InvestmentsInNumberOfPortfolioCompanies_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_MarketCapitalization_lbl0" xml:lang="en-US">Amount of Market capitalization.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MarketCapitalization" xlink:to="muzi_MarketCapitalization_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_NetAccretionOfDiscountOnInvestments_lbl0" xml:lang="en-US">Represent the net accretion of discount on investments.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAccretionOfDiscountOnInvestments" xlink:to="muzi_NetAccretionOfDiscountOnInvestments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_NetAssetValuePerSharePercentEquitySecurities_lbl0" xml:lang="en-US">The percentage of Net Asset Value Per Share, Percent Equity Securities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAssetValuePerSharePercentEquitySecurities" xlink:to="muzi_NetAssetValuePerSharePercentEquitySecurities_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_NetAssetsPayableDate_lbl0" xml:lang="en-US">Date the Assets to be paid was declared, in YYYY-MM-DD format.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAssetsPayableDate" xlink:to="muzi_NetAssetsPayableDate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_NetChangeInUnrealizedAppreciationdepreciation_lbl0" xml:lang="en-US">Net change in unrealized appreciation/(depreciation).</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetChangeInUnrealizedAppreciationdepreciation" xlink:to="muzi_NetChangeInUnrealizedAppreciationdepreciation_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_NetExpensesOperating_lbl0" xml:lang="en-US">Net expenses, operating.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetExpensesOperating" xlink:to="muzi_NetExpensesOperating_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_NetRealizedGainsLossesAffiliatedInvestments_lbl0" xml:lang="en-US">The amount is net realized gains losses affiliated investments.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetRealizedGainsLossesAffiliatedInvestments" xlink:to="muzi_NetRealizedGainsLossesAffiliatedInvestments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policy for net realized gains or losses and net change in unrealized appreciation or depreciation.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock" xlink:to="muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_NoncontrolledNonaffiliatedInvestments_lbl0" xml:lang="en-US">Amount of non controlled non affiliated investments.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NoncontrolledNonaffiliatedInvestments" xlink:to="muzi_NoncontrolledNonaffiliatedInvestments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_OfferingCostsPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policies for offering Costs.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OfferingCostsPolicyTextBlock" xlink:to="muzi_OfferingCostsPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_OrganizationalAndOfferingFeesPayable_lbl0" xml:lang="en-US">Organizational and offering fees payable.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OrganizationalAndOfferingFeesPayable" xlink:to="muzi_OrganizationalAndOfferingFeesPayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_OtherIncomePolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policies for other income.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OtherIncomePolicyTextBlock" xlink:to="muzi_OtherIncomePolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_OutstandingSharesPercentage_lbl0" xml:lang="en-US">Outstanding shares percentage.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OutstandingSharesPercentage" xlink:to="muzi_OutstandingSharesPercentage_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PaymentinKindInterestPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policies for payment-in-kind interest.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PaymentinKindInterestPolicyTextBlock" xlink:to="muzi_PaymentinKindInterestPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_Paymentinkind_lbl0" xml:lang="en-US">Amount of payment-in-kind.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_Paymentinkind" xlink:to="muzi_Paymentinkind_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses_lbl0" xml:lang="en-US">Percentage of capital gains in excess of capital losses.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses" xlink:to="muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PercentageOfCarryForwardTaxableIncome_lbl0" xml:lang="en-US">Percentage of carry forward taxable income.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfCarryForwardTaxableIncome" xlink:to="muzi_PercentageOfCarryForwardTaxableIncome_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PercentageOfNetOrdinaryIncome_lbl0" xml:lang="en-US">Percentage of net ordinary income.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfNetOrdinaryIncome" xlink:to="muzi_PercentageOfNetOrdinaryIncome_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PercentageOfNondeductibleUSFederalExciseTax_lbl0" xml:lang="en-US">Percentage of nondeductible U.S. federal excise tax.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfNondeductibleUSFederalExciseTax" xlink:to="muzi_PercentageOfNondeductibleUSFederalExciseTax_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PercentageOfOutstandingVotingSecurities_lbl0" xml:lang="en-US">Percentage of outstanding voting securities.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfOutstandingVotingSecurities" xlink:to="muzi_PercentageOfOutstandingVotingSecurities_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PercentageOfTotalAssets_lbl0" xml:lang="en-US">Percentage of Total Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfTotalAssets" xlink:to="muzi_PercentageOfTotalAssets_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PrincipalPaydownsPolicyTextBlock_lbl0" xml:lang="en-US">The disclosure of accounting policies for principal paydowns.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PrincipalPaydownsPolicyTextBlock" xlink:to="muzi_PrincipalPaydownsPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_ProceedsFromAdvanceShareSubscriptionAmount_lbl0" xml:lang="en-US">Represent the amount of advance share subscription amount.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ProceedsFromAdvanceShareSubscriptionAmount" xlink:to="muzi_ProceedsFromAdvanceShareSubscriptionAmount_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PurchasesAndDrawdownsOfInvestments_lbl0" xml:lang="en-US">Amount of purchases and draw downs of investments.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PurchasesAndDrawdownsOfInvestments" xlink:to="muzi_PurchasesAndDrawdownsOfInvestments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement_lbl0" xml:lang="en-US">Percentage of ratio of total expenses to average net assets with reimbursement.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement" xlink:to="muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement_lbl0" xml:lang="en-US">Percentage of ratio of total expenses to average net assets without reimbursement.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement" xlink:to="muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_RealizedCapitalGainsPercentage_lbl0" xml:lang="en-US">Realized capital gains percentage.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RealizedCapitalGainsPercentage" xlink:to="muzi_RealizedCapitalGainsPercentage_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock_lbl0" xml:lang="en-US">Tabular disclosure of Components of Total Distributable (Accumulated) Earnings (Losses) on Tax Basis.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock" xlink:to="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock_lbl0" xml:lang="en-US">Tabular disclosure of the total distributable earnings and its tax-basis.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock" xlink:to="muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock_lbl0" xml:lang="en-US">Schedule of net change in unrealized appreciation (depreciation) Table Text Block.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock" xlink:to="muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_ScheduleOfSharesIssuedTableTextBlock_lbl0" xml:lang="en-US">Schedule of shares issued.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfSharesIssuedTableTextBlock" xlink:to="muzi_ScheduleOfSharesIssuedTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_TotalDistributableEarnings_lbl0" xml:lang="en-US">The amount of total distributable earnings.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TotalDistributableEarnings" xlink:to="muzi_TotalDistributableEarnings_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_UnfundedCommitmentsExpirationDate_lbl0" xml:lang="en-US">Unfunded commitments expiration date.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_UnfundedCommitmentsExpirationDate" xlink:to="muzi_UnfundedCommitmentsExpirationDate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_UnrealizedEarningsLossesnet_lbl0" xml:lang="en-US">The amount of unrealized earning losses.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_UnrealizedEarningsLossesnet" xlink:to="muzi_UnrealizedEarningsLossesnet_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policy for valuation of portfolio securities.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock" xlink:to="muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_WaiverOfBaseManagementFees_lbl0" xml:lang="en-US">The amount of waiver of base management fees.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_WaiverOfBaseManagementFees" xlink:to="muzi_WaiverOfBaseManagementFees_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_WeightedaverageSharesOutstanding_lbl0" xml:lang="en-US">Weighted average shares outstanding per share value.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_WeightedaverageSharesOutstanding" xlink:to="muzi_WeightedaverageSharesOutstanding_lbl0"/>
    <loc xlink:type="locator" xlink:label="srt_ChiefExecutiveOfficerMember" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ChiefExecutiveOfficerMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_ChiefExecutiveOfficerMember_lbl" xml:lang="en-US">Chief Executive Officer</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_ChiefExecutiveOfficerMember" xlink:to="srt_ChiefExecutiveOfficerMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherCommitmentsTableTextBlock_lbl0" xml:lang="en-US">Other Commitments [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherCommitmentsTableTextBlock" xlink:to="us-gaap_OtherCommitmentsTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsAbstract_lbl0" xml:lang="en-US">Assets [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_WeightedaverageSharesOutstanding_lbl1" xml:lang="en-US">Weightedaverage Shares Outstanding</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_WeightedaverageSharesOutstanding" xlink:to="muzi_WeightedaverageSharesOutstanding_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_CorporateBondInvestmentsMember_lbl0" xml:lang="en-US">Corporate Bond Investments Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CorporateBondInvestmentsMember" xlink:to="muzi_CorporateBondInvestmentsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareDiluted_lbl1" xml:lang="en-US">Earnings Per Share, Diluted</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareDiluted" xlink:to="us-gaap_EarningsPerShareDiluted_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AprilOneTwoZeroTwoSixMember_lbl0" xml:lang="en-US">April One Two Zero Two Six Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AprilOneTwoZeroTwoSixMember" xlink:to="muzi_AprilOneTwoZeroTwoSixMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShareAbstract_lbl0" xml:lang="en-US">Investment Company, Investment Income (Loss) from Operations, Per Share [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShareAbstract" xlink:to="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShareAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl1" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetAssetsPayableDate_lbl1" xml:lang="en-US">Net Assets Payable Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAssetsPayableDate" xlink:to="muzi_NetAssetsPayableDate_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GrossInvestmentIncomeOperating_lbl0" xml:lang="en-US">Gross Investment Income, Operating</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GrossInvestmentIncomeOperating" xlink:to="us-gaap_GrossInvestmentIncomeOperating_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_NonRule10b51ArrTrmntdFlag_lbl0" xml:lang="en-US">Non-Rule 10b5-1 Arrangement Terminated [Flag]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_NonRule10b51ArrTrmntdFlag" xlink:to="ecd_NonRule10b51ArrTrmntdFlag_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PrincipalPaydownsPolicyTextBlock_lbl1" xml:lang="en-US">Principal Paydowns Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PrincipalPaydownsPolicyTextBlock" xlink:to="muzi_PrincipalPaydownsPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_MarchTwentyOneTwoZeroTwoFiveMember_lbl0" xml:lang="en-US">March Twenty One Two Zero Two Five Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MarchTwentyOneTwoZeroTwoFiveMember" xlink:to="muzi_MarchTwentyOneTwoZeroTwoFiveMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DiversifiedSupportServicesMember_lbl0" xml:lang="en-US">Diversified Support Services Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiversifiedSupportServicesMember" xlink:to="muzi_DiversifiedSupportServicesMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetAssetValuePerSharePercentEquitySecurities_lbl1" xml:lang="en-US">Net Asset Value Per Share Percent Equity Securities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAssetValuePerSharePercentEquitySecurities" xlink:to="muzi_NetAssetValuePerSharePercentEquitySecurities_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration_lbl0" xml:lang="en-US">Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration" xlink:to="us-gaap_SegmentReportingCodmIndividualTitleAndPositionOrGroupOrCommitteeNameExtensibleEnumeration_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfIncentiveDistributionsMadeToManagingMembersOrGeneralPartnersByDistributionTextBlock_lbl0" xml:lang="en-US">Schedule of Incentive Distributions Made to Managing Members or General Partners by Distribution [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfIncentiveDistributionsMadeToManagingMembersOrGeneralPartnersByDistributionTextBlock" xlink:to="us-gaap_ScheduleOfIncentiveDistributionsMadeToManagingMembersOrGeneralPartnersByDistributionTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_BroadcastingMember_lbl0" xml:lang="en-US">Broadcasting Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_BroadcastingMember" xlink:to="muzi_BroadcastingMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_TelecommunicationsMember_lbl0" xml:lang="en-US">Telecommunications Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TelecommunicationsMember" xlink:to="muzi_TelecommunicationsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_LocationStatementsOfFinancialPositionBalanceAxis_lbl0" xml:lang="en-US">Location Statements Of Financial Position Balance Axis</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LocationStatementsOfFinancialPositionBalanceAxis" xlink:to="muzi_LocationStatementsOfFinancialPositionBalanceAxis_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestIncomeOperatingPaidInKind_lbl0" xml:lang="en-US">Interest Income, Operating, Paid in Kind</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestIncomeOperatingPaidInKind" xlink:to="us-gaap_InterestIncomeOperatingPaidInKind_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_lbl0" xml:lang="en-US">Stock Issued During Period, Value, Dividend Reinvestment Plan</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:to="us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl0" xml:lang="en-US">Stock Issued During Period, Shares, New Issues</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RealizedInvestmentGainsLosses_lbl2" xml:lang="en-US">Realized Investment Gains (Losses)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RealizedInvestmentGainsLosses" xlink:to="us-gaap_RealizedInvestmentGainsLosses_lbl2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIncomeInterest_lbl0" xml:lang="en-US">Investment Income, Interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeInterest" xlink:to="us-gaap_InvestmentIncomeInterest_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DividendsPayableCurrentAndNoncurrent_lbl0" xml:lang="en-US">Dividends Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:to="us-gaap_DividendsPayableCurrentAndNoncurrent_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction_lbl1" xml:lang="en-US">Investment Company, Capital Share Transaction, Increase (Decrease)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction" xlink:to="us-gaap_InvestmentCompanyIncreaseDecreaseFromShareTransaction_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentMaturityDate_lbl0" xml:lang="en-US">Investment Maturity Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentMaturityDate" xlink:to="us-gaap_InvestmentMaturityDate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ContainersMember_lbl0" xml:lang="en-US">Containers [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ContainersMember" xlink:to="us-gaap_ContainersMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetRealizedGainsLossesAndUnrealizedAppreciationDepreciationOnInvestmentsAbstract_lbl0" xml:lang="en-US">Net Realized Gains Losses And Unrealized Appreciation Depreciation On Investments Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetRealizedGainsLossesAndUnrealizedAppreciationDepreciationOnInvestmentsAbstract" xlink:to="muzi_NetRealizedGainsLossesAndUnrealizedAppreciationDepreciationOnInvestmentsAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdditionalPaidInCapital_lbl0" xml:lang="en-US">Additional Paid in Capital</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdditionalPaidInCapital" xlink:to="us-gaap_AdditionalPaidInCapital_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_lbl0" xml:lang="en-US">Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_CompanyCommonStockShareValuationPolicyTextBlock_lbl1" xml:lang="en-US">Company Common Stock Share Valuation Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CompanyCommonStockShareValuationPolicyTextBlock" xlink:to="muzi_CompanyCommonStockShareValuationPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl0" xml:lang="en-US">Supplemental Cash Flow Information [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="us-gaap_SupplementalCashFlowInformationAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentsNonControlledNonAffiliatedAbstract_lbl0" xml:lang="en-US">Investments Non Controlled Non Affiliated Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentsNonControlledNonAffiliatedAbstract" xlink:to="muzi_InvestmentsNonControlledNonAffiliatedAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentIncomeFromNonControlledNonAffiliatedInvestmentsAndCashEquivalentsAbstract_lbl0" xml:lang="en-US">Investment Income From Non Controlled Non Affiliated Investments And Cash Equivalents Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentIncomeFromNonControlledNonAffiliatedInvestmentsAndCashEquivalentsAbstract" xlink:to="muzi_InvestmentIncomeFromNonControlledNonAffiliatedInvestmentsAndCashEquivalentsAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_Rule10b51ArrTrmntdFlag_lbl0" xml:lang="en-US">Rule 10b5-1 Arrangement Terminated [Flag]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_Rule10b51ArrTrmntdFlag" xlink:to="ecd_Rule10b51ArrTrmntdFlag_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentPolicyTextBlock_lbl0" xml:lang="en-US">Investment, Policy [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentPolicyTextBlock" xlink:to="us-gaap_InvestmentPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_MarketCapitalization_lbl1" xml:lang="en-US">Market Capitalization</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MarketCapitalization" xlink:to="muzi_MarketCapitalization_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences_lbl1" xml:lang="en-US">Additional Paidin Capital Permanent Book Tax Differences</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences" xlink:to="muzi_AdditionalPaidinCapitalPermanentBookTaxDifferences_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl0" xml:lang="en-US">Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_IncurredFees_lbl1" xml:lang="en-US">Incurred Fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncurredFees" xlink:to="muzi_IncurredFees_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentTextBlock_lbl0" xml:lang="en-US">Investment [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentTextBlock" xlink:to="us-gaap_InvestmentTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl1" xml:lang="en-US">Common Stock, Shares, Outstanding</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesOutstanding" xlink:to="us-gaap_CommonStockSharesOutstanding_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_UnrealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract_lbl0" xml:lang="en-US">Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnrealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract" xlink:to="us-gaap_UnrealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentOwnedAtFairValue_lbl2" xml:lang="en-US">Investment Owned, Fair Value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedAtFairValue" xlink:to="us-gaap_InvestmentOwnedAtFairValue_lbl2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit_lbl1" xml:lang="en-US">Retained Earnings (Accumulated Deficit)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_MinimumMember_lbl0" xml:lang="en-US">Minimum [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MinimumMember" xlink:to="srt_MinimumMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AccruedOtherGeneralAndAdministrativeExpenses_lbl1" xml:lang="en-US">Accrued Other General And Administrative Expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AccruedOtherGeneralAndAdministrativeExpenses" xlink:to="muzi_AccruedOtherGeneralAndAdministrativeExpenses_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock_lbl1" xml:lang="en-US">Schedule Of Investment Company Income Taxes Distributable Earnings Table Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock" xlink:to="muzi_ScheduleOfInvestmentCompanyIncomeTaxesDistributableEarningsTableTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetChangeInUnrealizedAppreciationdepreciation_lbl1" xml:lang="en-US">Net Change In Unrealized Appreciationdepreciation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetChangeInUnrealizedAppreciationdepreciation" xlink:to="muzi_NetChangeInUnrealizedAppreciationdepreciation_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AcquisitionDate_lbl1" xml:lang="en-US">Acquisition Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AcquisitionDate" xlink:to="muzi_AcquisitionDate_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetInvestmentIncome_lbl1" xml:lang="en-US">Net Investment Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetInvestmentIncome" xlink:to="us-gaap_NetInvestmentIncome_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_TransportationExcludingAirRailMember_lbl0" xml:lang="en-US">Transportation Excluding Air Rail Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TransportationExcludingAirRailMember" xlink:to="muzi_TransportationExcludingAirRailMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_SeniorSecuredLoanInvestmentsNonLiquidMember_lbl0" xml:lang="en-US">Senior Secured Loan Investments Non Liquid Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanInvestmentsNonLiquidMember" xlink:to="muzi_SeniorSecuredLoanInvestmentsNonLiquidMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare_lbl0" xml:lang="en-US">Investment Company, Investment Income (Loss) from Operations, Per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare" xlink:to="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl0" xml:lang="en-US">Fair Value, Inputs, Level 2 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel2Member" xlink:to="us-gaap_FairValueInputsLevel2Member_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfChangesInTheFairValueOfInvestmentsAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfChangesInTheFairValueOfInvestmentsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfChangesInTheFairValueOfInvestmentsAbstract_lbl" xml:lang="en-US">Schedule Of Changes In The Fair Value Of Investments Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfChangesInTheFairValueOfInvestmentsAbstract" xlink:to="muzi_ScheduleOfChangesInTheFairValueOfInvestmentsAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="country_US_lbl0" xml:lang="en-US">UNITED STATES</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="country_US" xlink:to="country_US_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedTemporaryDifferenceOther_lbl0" xml:lang="en-US">Investment Company, Distributable Earnings (Loss), Accumulated Temporary Difference, Other</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedTemporaryDifferenceOther" xlink:to="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedTemporaryDifferenceOther_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NoninterestExpenseDirectorsFees_lbl0" xml:lang="en-US">Director Fee</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NoninterestExpenseDirectorsFees" xlink:to="us-gaap_NoninterestExpenseDirectorsFees_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyTotalReturn_lbl0" xml:lang="en-US">Investment Company, Total Return</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyTotalReturn" xlink:to="us-gaap_InvestmentCompanyTotalReturn_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare_lbl0" xml:lang="en-US">Investment Company, Investment Income (Loss), Per Share, Basic</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare" xlink:to="us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_MaximumMember_lbl0" xml:lang="en-US">Maximum [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_MaximumMember" xlink:to="srt_MaximumMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl0" xml:lang="en-US">Income Tax, Policy [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxPolicyTextBlock" xlink:to="us-gaap_IncomeTaxPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl0" xml:lang="en-US">Common Stock, Shares Authorized</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesAuthorized" xlink:to="us-gaap_CommonStockSharesAuthorized_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_NonRule10b51ArrAdoptedFlag_lbl0" xml:lang="en-US">Non-Rule 10b5-1 Arrangement Adopted [Flag]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_NonRule10b51ArrAdoptedFlag" xlink:to="ecd_NonRule10b51ArrAdoptedFlag_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyIncentiveFeeToAverageNetAssets_lbl0" xml:lang="en-US">Investment Company, Incentive Fee to Average Net Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyIncentiveFeeToAverageNetAssets" xlink:to="us-gaap_InvestmentCompanyIncentiveFeeToAverageNetAssets_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_GamingMember_lbl0" xml:lang="en-US">Gaming Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_GamingMember" xlink:to="muzi_GamingMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PreferredStockMember_lbl0" xml:lang="en-US">Preferred Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PreferredStockMember" xlink:to="us-gaap_PreferredStockMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock_lbl0" xml:lang="en-US">Investment Company, Financial Highlights [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock" xlink:to="us-gaap_InvestmentCompanyFinancialHighlightsTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ReceivablesAbstract_lbl0" xml:lang="en-US">Receivables [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ReceivablesAbstract" xlink:to="us-gaap_ReceivablesAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyChangesInNetAssetsTableTextBlock_lbl0" xml:lang="en-US">Investment Company, Change in Net Assets [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyChangesInNetAssetsTableTextBlock" xlink:to="us-gaap_InvestmentCompanyChangesInNetAssetsTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PercentageOfTotalAssets_lbl1" xml:lang="en-US">Percentage Of Total Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfTotalAssets" xlink:to="muzi_PercentageOfTotalAssets_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PrimeTimeSpecialtyVehicleLLCMember_lbl0" xml:lang="en-US">Prime Time Specialty Vehicle LLCMember</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PrimeTimeSpecialtyVehicleLLCMember" xlink:to="muzi_PrimeTimeSpecialtyVehicleLLCMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl0" xml:lang="en-US">Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetRegulatoryAssets_lbl0" xml:lang="en-US">Net Regulatory Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetRegulatoryAssets" xlink:to="us-gaap_NetRegulatoryAssets_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestAndDividendIncomeOperatingPaidInKind_lbl0" xml:lang="en-US">Interest and Dividend Income, Operating, Paid in Kind</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestAndDividendIncomeOperatingPaidInKind" xlink:to="us-gaap_InterestAndDividendIncomeOperatingPaidInKind_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ServicesMember_lbl0" xml:lang="en-US">Services Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ServicesMember" xlink:to="muzi_ServicesMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique_lbl1" xml:lang="en-US">Investment Company Investment Owned Fair Value Valuation Technique</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique" xlink:to="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_HealthcareSectorMember_lbl0" xml:lang="en-US">Healthcare Sector [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_HealthcareSectorMember" xlink:to="us-gaap_HealthcareSectorMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyFinancialHighlightsTextBlock_lbl0" xml:lang="en-US">Investment Company, Financial Highlights [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyFinancialHighlightsTextBlock" xlink:to="us-gaap_InvestmentCompanyFinancialHighlightsTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl0" xml:lang="en-US">Significant Accounting Policies [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl0" xml:lang="en-US">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_CollaterisedDebtObligationMember_lbl0" xml:lang="en-US">Collaterised Debt Obligation Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CollaterisedDebtObligationMember" xlink:to="muzi_CollaterisedDebtObligationMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl0" xml:lang="en-US">Payments for Repurchase of Common Stock</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:to="us-gaap_PaymentsForRepurchaseOfCommonStock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyDistributionToShareholdersAbstract_lbl0" xml:lang="en-US">Investment Company, Distribution to Shareholders [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributionToShareholdersAbstract" xlink:to="us-gaap_InvestmentCompanyDistributionToShareholdersAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock_lbl1" xml:lang="en-US">Valuation Of Portfolio Securities Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock" xlink:to="muzi_ValuationOfPortfolioSecuritiesPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl0" xml:lang="en-US">Segment Reporting, Policy [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentReportingPolicyPolicyTextBlock" xlink:to="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_GainLossOnInvestments_lbl0" xml:lang="en-US">Gain (Loss) on Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_GainLossOnInvestments" xlink:to="us-gaap_GainLossOnInvestments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyTaxReturnOfCapitalDistributionPerShare_lbl0" xml:lang="en-US">Investment Company, Tax Return of Capital Distribution, Per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyTaxReturnOfCapitalDistributionPerShare" xlink:to="us-gaap_InvestmentCompanyTaxReturnOfCapitalDistributionPerShare_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl0" xml:lang="en-US">Fair Value, Inputs, Level 3 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel3Member" xlink:to="us-gaap_FairValueInputsLevel3Member_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_IncreaseDecreaseInProfessionalFeesPayable_lbl1" xml:lang="en-US">Increase Decrease In Professional Fees Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInProfessionalFeesPayable" xlink:to="muzi_IncreaseDecreaseInProfessionalFeesPayable_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossRatio_lbl0" xml:lang="en-US">Investment Company, Investment Income (Loss) Ratio</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyInvestmentIncomeLossRatio" xlink:to="us-gaap_InvestmentCompanyInvestmentIncomeLossRatio_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl0" xml:lang="en-US">Related Party Transactions Disclosure [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:to="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock_lbl1" xml:lang="en-US">Net Realized Gains Or Losses And Net Change In Unrealized Appreciation Or Depreciation Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock" xlink:to="muzi_NetRealizedGainsOrLossesAndNetChangeInUnrealizedAppreciationOrDepreciationPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PercentageOfOutstandingVotingSecurities_lbl1" xml:lang="en-US">Percentage Of Outstanding Voting Securities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfOutstandingVotingSecurities" xlink:to="muzi_PercentageOfOutstandingVotingSecurities_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl0" xml:lang="en-US">Cash Provided by (Used in) Operating Activity, Including Discontinued Operation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShareAbstract_lbl0" xml:lang="en-US">Investment Company, Gain (Loss) on Investment, Per Share [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShareAbstract" xlink:to="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShareAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement_lbl1" xml:lang="en-US">Ratio Of Total Expenses To Average Net Assets Without Reimbursement</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement" xlink:to="muzi_RatioOfTotalExpensesToAverageNetAssetsWithoutReimbursement_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_TotalDistributableEarnings_lbl1" xml:lang="en-US">Total Distributable Earnings</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TotalDistributableEarnings" xlink:to="muzi_TotalDistributableEarnings_lbl1"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfConsolidatedFinancialHighlightsAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfConsolidatedFinancialHighlightsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfConsolidatedFinancialHighlightsAbstract_lbl" xml:lang="en-US">Schedule Of Consolidated Financial Highlights Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfConsolidatedFinancialHighlightsAbstract" xlink:to="muzi_ScheduleOfConsolidatedFinancialHighlightsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfNetChangeInUnrealizedAppreciationDepreciationAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfNetChangeInUnrealizedAppreciationDepreciationAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfNetChangeInUnrealizedAppreciationDepreciationAbstract_lbl" xml:lang="en-US">Schedule Of Net Change In Unrealized Appreciation Depreciation Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfNetChangeInUnrealizedAppreciationDepreciationAbstract" xlink:to="muzi_ScheduleOfNetChangeInUnrealizedAppreciationDepreciationAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_TermLoanMember_lbl0" xml:lang="en-US">Term Loan Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TermLoanMember" xlink:to="muzi_TermLoanMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_BuildingMaterialsMember_lbl0" xml:lang="en-US">Building Materials Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_BuildingMaterialsMember" xlink:to="muzi_BuildingMaterialsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl0" xml:lang="en-US">Fair Value, Inputs, Level 1 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueInputsLevel1Member" xlink:to="us-gaap_FairValueInputsLevel1Member_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_lbl0" xml:lang="en-US">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedAppreciation_lbl0" xml:lang="en-US">Investment, Tax Basis, Unrealized Gain</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedAppreciation" xlink:to="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedAppreciation_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl0" xml:lang="en-US">Cash and Cash Equivalents, Policy [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:to="us-gaap_CashAndCashEquivalentsPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_JanuaryTwoTwoZeroTwoFiveMember_lbl0" xml:lang="en-US">January Two Two Zero Two Five Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_JanuaryTwoTwoZeroTwoFiveMember" xlink:to="muzi_JanuaryTwoTwoZeroTwoFiveMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquity_lbl0" xml:lang="en-US">Equity, Attributable to Parent</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquity" xlink:to="us-gaap_StockholdersEquity_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_OfferingCostsPolicyTextBlock_lbl1" xml:lang="en-US">Offering Costs Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OfferingCostsPolicyTextBlock" xlink:to="muzi_OfferingCostsPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_FoodBeverageTobaccoMember_lbl0" xml:lang="en-US">Food Beverage Tobacco Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FoodBeverageTobaccoMember" xlink:to="muzi_FoodBeverageTobaccoMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_OtherIncomePolicyTextBlock_lbl1" xml:lang="en-US">Other Income Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OtherIncomePolicyTextBlock" xlink:to="muzi_OtherIncomePolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_EquityInvestmentsWarrantsMember_lbl0" xml:lang="en-US">Equity Investments Warrants Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsWarrantsMember" xlink:to="muzi_EquityInvestmentsWarrantsMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfCompanyDeclaredDistributionsAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfCompanyDeclaredDistributionsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfCompanyDeclaredDistributionsAbstract_lbl" xml:lang="en-US">Schedule Of Company Declared Distributions Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfCompanyDeclaredDistributionsAbstract" xlink:to="muzi_ScheduleOfCompanyDeclaredDistributionsAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInManagementFeePayable_lbl0" xml:lang="en-US">Increase (Decrease) in Management Fee Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInManagementFeePayable" xlink:to="us-gaap_IncreaseDecreaseInManagementFeePayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIncomeNet_lbl0" xml:lang="en-US">Investment Income, Net</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeNet" xlink:to="us-gaap_InvestmentIncomeNet_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit_lbl0" xml:lang="en-US">Distribution Made to Limited Liability Company (LLC) Member, Distributions Paid, Per Unit</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit" xlink:to="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionsPaidPerUnit_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_EnergyMember_lbl0" xml:lang="en-US">Energy Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EnergyMember" xlink:to="muzi_EnergyMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_MayEightTwoZeroTwoSixMember_lbl0" xml:lang="en-US">May Eight Two Zero Two Six Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MayEightTwoZeroTwoSixMember" xlink:to="muzi_MayEightTwoZeroTwoSixMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_Rule10b51ArrAdoptedFlag_lbl0" xml:lang="en-US">Rule 10b5-1 Arrangement Adopted [Flag]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_Rule10b51ArrAdoptedFlag" xlink:to="ecd_Rule10b51ArrAdoptedFlag_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyExcessExpenseReimbursable_lbl0" xml:lang="en-US">Investment Company, Reimbursable Excess Expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyExcessExpenseReimbursable" xlink:to="us-gaap_InvestmentCompanyExcessExpenseReimbursable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PercentageOfNetOrdinaryIncome_lbl1" xml:lang="en-US">Percentage Of Net Ordinary Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfNetOrdinaryIncome" xlink:to="muzi_PercentageOfNetOrdinaryIncome_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ReceivableInvestmentSale_lbl0" xml:lang="en-US">Receivable, Investment, Sale</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ReceivableInvestmentSale" xlink:to="us-gaap_ReceivableInvestmentSale_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ConsolidatedScheduleOfInvestmentsAbstract" xlink:href="muzi-20260630.xsd#muzi_ConsolidatedScheduleOfInvestmentsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ConsolidatedScheduleOfInvestmentsAbstract_lbl" xml:lang="en-US">Consolidated Schedule Of Investments Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ConsolidatedScheduleOfInvestmentsAbstract" xlink:to="muzi_ConsolidatedScheduleOfInvestmentsAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentInterestRate_lbl0" xml:lang="en-US">Investment Interest Rate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentInterestRate" xlink:to="us-gaap_InvestmentInterestRate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_HealthCareMember_lbl0" xml:lang="en-US">Health Care [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_HealthCareMember" xlink:to="us-gaap_HealthCareMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentForManagementFee_lbl0" xml:lang="en-US">Payment for Management Fee</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentForManagementFee" xlink:to="us-gaap_PaymentForManagementFee_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyDividendDistribution_lbl0" xml:lang="en-US">Investment Company, Dividend Distribution</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDividendDistribution" xlink:to="us-gaap_InvestmentCompanyDividendDistribution_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm_lbl1" xml:lang="en-US">Investment Company Distributable Earnings Loss Accumulated Short Term Capital Gain Losshort Term</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm" xlink:to="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLosshortTerm_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl0" xml:lang="en-US">Equity [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:to="us-gaap_StockholdersEquityNoteDisclosureTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses_lbl1" xml:lang="en-US">Increase Decrease In Accrued Other General And Administrative Expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses" xlink:to="muzi_IncreaseDecreaseInAccruedOtherGeneralAndAdministrativeExpenses_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl0" xml:lang="en-US">Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:to="us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOtherReceivables_lbl0" xml:lang="en-US">Increase (Decrease) in Other Receivables</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInOtherReceivables" xlink:to="us-gaap_IncreaseDecreaseInOtherReceivables_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockDividendsPerShareDeclared_lbl0" xml:lang="en-US">Common Stock, Dividends, Per Share, Declared</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockDividendsPerShareDeclared" xlink:to="us-gaap_CommonStockDividendsPerShareDeclared_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DealOriginationCostsPolicyTextBlock_lbl1" xml:lang="en-US">Deal Origination Costs Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DealOriginationCostsPolicyTextBlock" xlink:to="muzi_DealOriginationCostsPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DecemberTwentySevenTwoZeroTwoFiveMember_lbl0" xml:lang="en-US">December Twenty Seven Two Zero Two Five Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DecemberTwentySevenTwoZeroTwoFiveMember" xlink:to="muzi_DecemberTwentySevenTwoZeroTwoFiveMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpenses_lbl0" xml:lang="en-US">Operating Expenses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingExpenses_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl1" xml:lang="en-US">Cash and Cash Equivalent</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl1"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfDistributionsDeclaredAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfDistributionsDeclaredAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfDistributionsDeclaredAbstract_lbl" xml:lang="en-US">Schedule Of Distributions Declared Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfDistributionsDeclaredAbstract" xlink:to="muzi_ScheduleOfDistributionsDeclaredAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl0" xml:lang="en-US">Shares Issued, Price Per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesIssuedPricePerShare" xlink:to="us-gaap_SharesIssuedPricePerShare_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestIncomeOperatingAbstract_lbl0" xml:lang="en-US">Interest Income, Operating [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestIncomeOperatingAbstract" xlink:to="us-gaap_InterestIncomeOperatingAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_TransportationInfrastructureMember_lbl0" xml:lang="en-US">Transportation Infrastructure Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TransportationInfrastructureMember" xlink:to="muzi_TransportationInfrastructureMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyFinancialRatiosAbstract_lbl0" xml:lang="en-US">Investment Company, Financial Ratios [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyFinancialRatiosAbstract" xlink:to="us-gaap_InvestmentCompanyFinancialRatiosAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_lbl0" xml:lang="en-US">Accretion (Amortization) of Discounts and Premiums, Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" xlink:to="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl0" xml:lang="en-US">Proceeds from Issuance of Common Stock</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PerQuarterMember_lbl0" xml:lang="en-US">Per Quarter Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PerQuarterMember" xlink:to="muzi_PerQuarterMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AirlinesMember_lbl0" xml:lang="en-US">Airlines Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AirlinesMember" xlink:to="muzi_AirlinesMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfSharesIssuedAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfSharesIssuedAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfSharesIssuedAbstract_lbl" xml:lang="en-US">Schedule Of Shares Issued Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfSharesIssuedAbstract" xlink:to="muzi_ScheduleOfSharesIssuedAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NumberOfReportableSegments_lbl0" xml:lang="en-US">Number of Reportable Segments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NumberOfReportableSegments" xlink:to="us-gaap_NumberOfReportableSegments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIdentifierAxis_lbl1" xml:lang="en-US">Investment, Identifier [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIdentifierAxis" xlink:to="us-gaap_InvestmentIdentifierAxis_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ShortTermInvestmentMoneyMarketFundsMember_lbl0" xml:lang="en-US">Short Term Investment Money Market Funds Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ShortTermInvestmentMoneyMarketFundsMember" xlink:to="muzi_ShortTermInvestmentMoneyMarketFundsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAbstract_lbl0" xml:lang="en-US">Liabilities [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_LiabilitiesAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncentiveFeePayable_lbl0" xml:lang="en-US">Incentive Fee Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncentiveFeePayable" xlink:to="us-gaap_IncentiveFeePayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_EquityInvestmentsPreferredStockOneMember_lbl0" xml:lang="en-US">Equity Investments Preferred Stock One Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsPreferredStockOneMember" xlink:to="muzi_EquityInvestmentsPreferredStockOneMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract_lbl1" xml:lang="en-US">Investment Company, Capital Share Transaction, Increase (Decrease) [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract" xlink:to="us-gaap_InvestmentCompanyCapitalShareTransactionsAbstract_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_Paymentinkind_lbl1" xml:lang="en-US">Paymentinkind</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_Paymentinkind" xlink:to="muzi_Paymentinkind_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_OrganizationalAndOfferingFeesPayable_lbl1" xml:lang="en-US">Organizational And Offering Fees Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OrganizationalAndOfferingFeesPayable" xlink:to="muzi_OrganizationalAndOfferingFeesPayable_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NumberOfOperatingSegments_lbl0" xml:lang="en-US">Number of Operating Segments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NumberOfOperatingSegments" xlink:to="us-gaap_NumberOfOperatingSegments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_UseOfEstimates_lbl0" xml:lang="en-US">Use of Estimates, Policy [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UseOfEstimates" xlink:to="us-gaap_UseOfEstimates_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_TechnologyMember_lbl0" xml:lang="en-US">Technology Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TechnologyMember" xlink:to="muzi_TechnologyMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestReceivable_lbl0" xml:lang="en-US">Interest Receivable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestReceivable" xlink:to="us-gaap_InterestReceivable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionPayable_lbl0" xml:lang="en-US">Distribution Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionPayable" xlink:to="us-gaap_DistributionPayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_HomebuildersRealEstateMember_lbl0" xml:lang="en-US">Homebuilders Real Estate Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_HomebuildersRealEstateMember" xlink:to="muzi_HomebuildersRealEstateMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentInterestRatePaidInCash_lbl0" xml:lang="en-US">Investment, Interest Rate, Paid in Cash</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentInterestRatePaidInCash" xlink:to="us-gaap_InvestmentInterestRatePaidInCash_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease_lbl0" xml:lang="en-US">Investment Company, Net Asset Value, Per Share, Period Increase (Decrease)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease" xlink:to="us-gaap_InvestmentCompanyNetAssetValuePerSharePeriodIncreaseDecrease_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockValue_lbl0" xml:lang="en-US">Common Stock, Value, Issued</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockValue" xlink:to="us-gaap_CommonStockValue_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInIncentiveFeePayable_lbl0" xml:lang="en-US">Increase (Decrease) in Incentive Fee Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInIncentiveFeePayable" xlink:to="us-gaap_IncreaseDecreaseInIncentiveFeePayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_MetalsMiningMember_lbl0" xml:lang="en-US">Metals Mining Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MetalsMiningMember" xlink:to="muzi_MetalsMiningMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ChemicalsMember_lbl0" xml:lang="en-US">Chemicals Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ChemicalsMember" xlink:to="muzi_ChemicalsMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfInformationAboutSignificantUnobservableInputsOfInvestmentsAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfInformationAboutSignificantUnobservableInputsOfInvestmentsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfInformationAboutSignificantUnobservableInputsOfInvestmentsAbstract_lbl" xml:lang="en-US">Schedule Of Information About Significant Unobservable Inputs Of Investments Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfInformationAboutSignificantUnobservableInputsOfInvestmentsAbstract" xlink:to="muzi_ScheduleOfInformationAboutSignificantUnobservableInputsOfInvestmentsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfFairValueHierarchyAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfFairValueHierarchyAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfFairValueHierarchyAbstract_lbl" xml:lang="en-US">Schedule Of Fair Value Hierarchy Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfFairValueHierarchyAbstract" xlink:to="muzi_ScheduleOfFairValueHierarchyAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable_lbl1" xml:lang="en-US">Increase Decrease In Organizational And Offering Fees Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable" xlink:to="muzi_IncreaseDecreaseInOrganizationalAndOfferingFeesPayable_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DistributionRecordDateAxis_lbl0" xml:lang="en-US">Distribution Record Date Axis</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionRecordDateAxis" xlink:to="muzi_DistributionRecordDateAxis_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfStockholdersEquityAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xml:lang="en-US">Statement of Stockholders&apos; Equity [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfStockholdersEquityAbstract" xlink:to="us-gaap_StatementOfStockholdersEquityAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl1" xml:lang="en-US">Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid_lbl0" xml:lang="en-US">Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Paid</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid" xlink:to="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_BasisOfAccountingPolicyPolicyTextBlock_lbl0" xml:lang="en-US">Basis of Accounting, Policy [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:to="us-gaap_BasisOfAccountingPolicyPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl0" xml:lang="en-US">Stock Issued During Period, Value, New Issues</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:to="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DividendsPayableAmount_lbl1" xml:lang="en-US">Dividends Payable Amount</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DividendsPayableAmount" xlink:to="muzi_DividendsPayableAmount_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ConsumerProductsMember_lbl0" xml:lang="en-US">Consumer Products Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ConsumerProductsMember" xlink:to="muzi_ConsumerProductsMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xml:lang="en-US">Income Statement [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_IncomeStatementAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl0" xml:lang="en-US">New Accounting Pronouncements, Policy [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:to="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfInvestmentPortfolioAtAmortizedCostAndFairValueAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfInvestmentPortfolioAtAmortizedCostAndFairValueAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfInvestmentPortfolioAtAmortizedCostAndFairValueAbstract_lbl" xml:lang="en-US">Schedule Of Investment Portfolio At Amortized Cost And Fair Value Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfInvestmentPortfolioAtAmortizedCostAndFairValueAbstract" xlink:to="muzi_ScheduleOfInvestmentPortfolioAtAmortizedCostAndFairValueAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDeclarationDate_lbl0" xml:lang="en-US">Distribution Made to Limited Liability Company (LLC) Member, Declaration Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDeclarationDate" xlink:to="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDeclarationDate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock_lbl1" xml:lang="en-US">Schedule Of Components Of Total Distributable Accumulated Earnings Losses On Tax Basis Table Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock" xlink:to="muzi_ScheduleOfComponentsOfTotalDistributableAccumulatedEarningsLossesOnTaxBasisTableTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_lbl0" xml:lang="en-US">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_SeniorSecuredLoanDebtInstrumentsNonLiquidMember_lbl0" xml:lang="en-US">Senior Secured Loan Debt Instruments Non Liquid Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInstrumentsNonLiquidMember" xlink:to="muzi_SeniorSecuredLoanDebtInstrumentsNonLiquidMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProfessionalFees_lbl0" xml:lang="en-US">Professional Fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProfessionalFees" xlink:to="us-gaap_ProfessionalFees_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfCommonStockIssuancesAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfCommonStockIssuancesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfCommonStockIssuancesAbstract_lbl" xml:lang="en-US">Schedule Of Common Stock Issuances Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfCommonStockIssuancesAbstract" xlink:to="muzi_ScheduleOfCommonStockIssuancesAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl0" xml:lang="en-US">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:to="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AmountOfAdviserVoluntarilyWaived_lbl1" xml:lang="en-US">Amount Of Adviser Voluntarily Waived</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AmountOfAdviserVoluntarilyWaived" xlink:to="muzi_AmountOfAdviserVoluntarilyWaived_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareBasic_lbl1" xml:lang="en-US">Earnings Per Share, Basic</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareBasic" xlink:to="us-gaap_EarningsPerShareBasic_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Assets_lbl0" xml:lang="en-US">Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Assets" xlink:to="us-gaap_Assets_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Liabilities_lbl0" xml:lang="en-US">Liabilities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Liabilities" xlink:to="us-gaap_Liabilities_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract_lbl0" xml:lang="en-US">Net Income (Loss), Including Portion Attributable to Noncontrolling Interest [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract" xlink:to="us-gaap_NetIncomeLossAttributableToReportingEntityAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation_lbl0" xml:lang="en-US">Investment, Tax Basis, Unrealized Loss</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation" xlink:to="us-gaap_TaxBasisOfInvestmentsGrossUnrealizedDepreciation_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventsTextBlock_lbl0" xml:lang="en-US">Subsequent Events [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventsTextBlock" xlink:to="us-gaap_SubsequentEventsTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficitAbstract_lbl0" xml:lang="en-US">Retained Earnings (Accumulated Deficit) [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsAccumulatedDeficitAbstract" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficitAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PercentageOfNondeductibleUSFederalExciseTax_lbl1" xml:lang="en-US">Percentage Of Nondeductible USFederal Excise Tax</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfNondeductibleUSFederalExciseTax" xlink:to="muzi_PercentageOfNondeductibleUSFederalExciseTax_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetAccretionOfDiscountOnInvestments_lbl1" xml:lang="en-US">Net Accretion Of Discount On Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAccretionOfDiscountOnInvestments" xlink:to="muzi_NetAccretionOfDiscountOnInvestments_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ProceedsFromSaleMaturityAndCollectionOfLongtermInvestments_lbl0" xml:lang="en-US">Proceeds from Sale, Maturity and Collection of Long-Term Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromSaleMaturityAndCollectionOfLongtermInvestments" xlink:to="us-gaap_ProceedsFromSaleMaturityAndCollectionOfLongtermInvestments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ChangesInOperatingAssetsAndLiabilitiesAbstract_lbl0" xml:lang="en-US">Changes In Operating Assets And Liabilities Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ChangesInOperatingAssetsAndLiabilitiesAbstract" xlink:to="muzi_ChangesInOperatingAssetsAndLiabilitiesAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ManagementAndIncentiveFeesExpense_lbl0" xml:lang="en-US">Management and Incentive Fees Expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ManagementAndIncentiveFeesExpense" xlink:to="us-gaap_ManagementAndIncentiveFeesExpense_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_CapitalGoodsMember_lbl0" xml:lang="en-US">Capital Goods Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CapitalGoodsMember" xlink:to="muzi_CapitalGoodsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIncomeTextBlock_lbl0" xml:lang="en-US">Investment Income [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeTextBlock" xlink:to="us-gaap_InvestmentIncomeTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_FairValueMember_lbl0" xml:lang="en-US">Fair Value Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueMember" xlink:to="muzi_FairValueMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentCompanySpreadAboveIndex_lbl1" xml:lang="en-US">Investment Company Spread Above Index</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanySpreadAboveIndex" xlink:to="muzi_InvestmentCompanySpreadAboveIndex_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EstimateOfFairValueFairValueDisclosureMember_lbl0" xml:lang="en-US">Estimate of Fair Value Measurement [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:to="us-gaap_EstimateOfFairValueFairValueDisclosureMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetRealizedGainsLossesAffiliatedInvestments_lbl1" xml:lang="en-US">Net Realized Gains Losses Affiliated Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetRealizedGainsLossesAffiliatedInvestments" xlink:to="muzi_NetRealizedGainsLossesAffiliatedInvestments_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_lbl0" xml:lang="en-US">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIncomeOperatingAfterExpenseAndTaxAbstract_lbl0" xml:lang="en-US">Investment Income, Operating, after Expense and Tax [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeOperatingAfterExpenseAndTaxAbstract" xlink:to="us-gaap_InvestmentIncomeOperatingAfterExpenseAndTaxAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PublishingPrintingMember_lbl0" xml:lang="en-US">Publishing Printing Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PublishingPrintingMember" xlink:to="muzi_PublishingPrintingMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DecemberTwentySevenTwoZeroTwoFourMember_lbl0" xml:lang="en-US">December Twenty Seven Two Zero Two Four Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DecemberTwentySevenTwoZeroTwoFourMember" xlink:to="muzi_DecemberTwentySevenTwoZeroTwoFourMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased_lbl0" xml:lang="en-US">Security Owned and Sold, Not yet Purchased Fair Value, Security Sold, Not yet Purchased</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased" xlink:to="us-gaap_SecurityOwnedAndSoldNotYetPurchasedFairValueSecuritySoldNotYetPurchased_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl0" xml:lang="en-US">Cash Provided by (Used in) Financing Activity, Including Discontinued Operation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentInterestRatePaidInKind_lbl0" xml:lang="en-US">Investment, Interest Rate, Paid in Kind</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentInterestRatePaidInKind" xlink:to="us-gaap_InvestmentInterestRatePaidInKind_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock_lbl1" xml:lang="en-US">Interest And Dividend Income Recognition Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock" xlink:to="muzi_InterestAndDividendIncomeRecognitionPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_RealizedCapitalGainsPercentage_lbl1" xml:lang="en-US">Realized Capital Gains Percentage</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RealizedCapitalGainsPercentage" xlink:to="muzi_RealizedCapitalGainsPercentage_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AutomotiveAutoPartsMember_lbl0" xml:lang="en-US">Automotive Auto Parts Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAutoPartsMember" xlink:to="muzi_AutomotiveAutoPartsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_lbl0" xml:lang="en-US">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentsFairValueDisclosure_lbl3" xml:lang="en-US">Investments, Fair Value Disclosure</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentsFairValueDisclosure" xlink:to="us-gaap_InvestmentsFairValueDisclosure_lbl3"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NoncontrolledNonaffiliatedInvestments_lbl1" xml:lang="en-US">Noncontrolled Nonaffiliated Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NoncontrolledNonaffiliatedInvestments" xlink:to="muzi_NoncontrolledNonaffiliatedInvestments_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ManagementFeeExpense_lbl0" xml:lang="en-US">Management Fee Expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ManagementFeeExpense" xlink:to="us-gaap_ManagementFeeExpense_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_CarolinaCenterForAutismServicesMember_lbl0" xml:lang="en-US">Carolina Center For Autism Services Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CarolinaCenterForAutismServicesMember" xlink:to="muzi_CarolinaCenterForAutismServicesMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent_lbl0" xml:lang="en-US">Accrued Professional Fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent" xlink:to="us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfStockholdersEquityTableTextBlock_lbl0" xml:lang="en-US">Schedule of Stockholders Equity [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfStockholdersEquityTableTextBlock" xlink:to="us-gaap_ScheduleOfStockholdersEquityTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PercentageOfCarryForwardTaxableIncome_lbl1" xml:lang="en-US">Percentage Of Carry Forward Taxable Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfCarryForwardTaxableIncome" xlink:to="muzi_PercentageOfCarryForwardTaxableIncome_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PaymentinKindInterestPolicyTextBlock_lbl1" xml:lang="en-US">Paymentin Kind Interest Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PaymentinKindInterestPolicyTextBlock" xlink:to="muzi_PaymentinKindInterestPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock_lbl1" xml:lang="en-US">Identification Of Non Accrual Investments Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock" xlink:to="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyDistributionToShareholdersPerShare_lbl0" xml:lang="en-US">Investment Company, Distribution to Shareholders, Per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributionToShareholdersPerShare" xlink:to="us-gaap_InvestmentCompanyDistributionToShareholdersPerShare_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubsequentEventMember_lbl0" xml:lang="en-US">Subsequent Event [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubsequentEventMember" xlink:to="us-gaap_SubsequentEventMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WarrantMember_lbl1" xml:lang="en-US">Warrant [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WarrantMember" xlink:to="us-gaap_WarrantMember_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AaristaLLCMember_lbl0" xml:lang="en-US">Aarista LLCMember</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AaristaLLCMember" xlink:to="muzi_AaristaLLCMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OtherGeneralAndAdministrativeExpense_lbl0" xml:lang="en-US">Other General and Administrative Expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherGeneralAndAdministrativeExpense" xlink:to="us-gaap_OtherGeneralAndAdministrativeExpense_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_UnrealizedGainLossOnInvestments_lbl3" xml:lang="en-US">Unrealized Gain (Loss) on Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_UnrealizedGainLossOnInvestments" xlink:to="us-gaap_UnrealizedGainLossOnInvestments_lbl3"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AmortizedCostMember_lbl0" xml:lang="en-US">Amortized Cost Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AmortizedCostMember" xlink:to="muzi_AmortizedCostMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_InsiderTrdPoliciesProcAdoptedFlag_lbl0" xml:lang="en-US">Insider Trading Policies and Procedures Adopted [Flag]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_InsiderTrdPoliciesProcAdoptedFlag" xlink:to="ecd_InsiderTrdPoliciesProcAdoptedFlag_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DiversifiedFinancialServicesMember_lbl0" xml:lang="en-US">Diversified Financial Services Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiversifiedFinancialServicesMember" xlink:to="muzi_DiversifiedFinancialServicesMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncentiveFeeExpense_lbl1" xml:lang="en-US">Incentive Fee Expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncentiveFeeExpense" xlink:to="us-gaap_IncentiveFeeExpense_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_lbl0" xml:lang="en-US">Foreign Currency Transactions and Translations Policy [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:to="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AdministrationAgreementMember_lbl0" xml:lang="en-US">Administration Agreement Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AdministrationAgreementMember" xlink:to="muzi_AdministrationAgreementMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfSharesIssuedTableTextBlock_lbl1" xml:lang="en-US">Schedule Of Shares Issued Table Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfSharesIssuedTableTextBlock" xlink:to="muzi_ScheduleOfSharesIssuedTableTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInSecurityDeposits_lbl0" xml:lang="en-US">Increase (Decrease) in Security Deposits</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInSecurityDeposits" xlink:to="us-gaap_IncreaseDecreaseInSecurityDeposits_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentIssuanceDate1_lbl0" xml:lang="en-US">Debt Instrument, Issuance Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentIssuanceDate1" xlink:to="us-gaap_DebtInstrumentIssuanceDate1_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentOwnedBalancePrincipalAmount_lbl0" xml:lang="en-US">Investment Owned, Balance, Principal Amount</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedBalancePrincipalAmount" xlink:to="us-gaap_InvestmentOwnedBalancePrincipalAmount_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_UtilitiesMember_lbl0" xml:lang="en-US">Utilities Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_UtilitiesMember" xlink:to="muzi_UtilitiesMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockMember_lbl0" xml:lang="en-US">Common Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockMember" xlink:to="us-gaap_CommonStockMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StatementOfCashFlowsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfCashFlowsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xml:lang="en-US">Statement of Cash Flows [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_StatementOfCashFlowsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="ecd_InsiderTradingArrLineItems" xlink:href="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd#ecd_InsiderTradingArrLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ecd_InsiderTradingArrLineItems_lbl" xml:lang="en-US">Insider Trading Arrangements [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ecd_InsiderTradingArrLineItems" xlink:to="ecd_InsiderTradingArrLineItems_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_MoneyMarketFundsMember_lbl0" xml:lang="en-US">Money Market Funds [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MoneyMarketFundsMember" xlink:to="us-gaap_MoneyMarketFundsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_IncreaseDecreaseInDirectorsFeesPayable_lbl1" xml:lang="en-US">Increase Decrease In Directors Fees Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncreaseDecreaseInDirectorsFeesPayable" xlink:to="muzi_IncreaseDecreaseInDirectorsFeesPayable_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashDistributionMember_lbl1" xml:lang="en-US">Cash Distribution [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CashDistributionMember" xlink:to="us-gaap_CashDistributionMember_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_lbl0" xml:lang="en-US">Fair Value, Assets Measured on Recurring Basis [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyTaxBasisTaxableIncomeLossBeforeDeductionForDistribution_lbl0" xml:lang="en-US">Investment Company, Tax Basis, Taxable Income (Loss), before Deduction for Distribution</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyTaxBasisTaxableIncomeLossBeforeDeductionForDistribution" xlink:to="us-gaap_InvestmentCompanyTaxBasisTaxableIncomeLossBeforeDeductionForDistribution_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_MayThirteenTwoZeroTwoFiveMember_lbl0" xml:lang="en-US">May Thirteen Two Zero Two Five Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MayThirteenTwoZeroTwoFiveMember" xlink:to="muzi_MayThirteenTwoZeroTwoFiveMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyCommittedCapital_lbl0" xml:lang="en-US">Investment Company, Committed Capital</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyCommittedCapital" xlink:to="us-gaap_InvestmentCompanyCommittedCapital_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentAdvisoryAgreementMember_lbl0" xml:lang="en-US">Investment Advisory Agreement Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentAdvisoryAgreementMember" xlink:to="muzi_InvestmentAdvisoryAgreementMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock_lbl1" xml:lang="en-US">Correction Of Prior Period Presentation Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock" xlink:to="muzi_CorrectionOfPriorPeriodPresentationPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_RailroadsMember_lbl0" xml:lang="en-US">Railroads Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RailroadsMember" xlink:to="muzi_RailroadsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement_lbl1" xml:lang="en-US">Ratio Of Total Expenses To Average Net Assets With Reimbursement</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement" xlink:to="muzi_RatioOfTotalExpensesToAverageNetAssetsWithReimbursement_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestExpenseOther_lbl0" xml:lang="en-US">Interest Expense, Other</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpenseOther" xlink:to="us-gaap_InterestExpenseOther_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_SuperRetailMember_lbl0" xml:lang="en-US">Super Retail Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SuperRetailMember" xlink:to="muzi_SuperRetailMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InsuranceMember_lbl0" xml:lang="en-US">Insurance Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InsuranceMember" xlink:to="muzi_InsuranceMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentsInNumberOfPortfolioCompanies_lbl1" xml:lang="en-US">Investments In Number Of Portfolio Companies</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentsInNumberOfPortfolioCompanies" xlink:to="muzi_InvestmentsInNumberOfPortfolioCompanies_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyDistributionOrdinaryIncome_lbl0" xml:lang="en-US">Investment Company, Distribution, Ordinary Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributionOrdinaryIncome" xlink:to="us-gaap_InvestmentCompanyDistributionOrdinaryIncome_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_UnfundedCommitmentsExpirationDate_lbl1" xml:lang="en-US">Unfunded Commitments Expiration Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_UnfundedCommitmentsExpirationDate" xlink:to="muzi_UnfundedCommitmentsExpirationDate_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes_lbl0" xml:lang="en-US">Investment, Tax Basis, Cost</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes" xlink:to="us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss_lbl0" xml:lang="en-US">Investment Company, Distributable Earnings (Loss), Accumulated Ordinary Income (Loss)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss" xlink:to="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLoss_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueMeasurementsSensitivityAnalysisDescription_lbl0" xml:lang="en-US">Unobservable Measurement Input, Uncertainty, Description</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueMeasurementsSensitivityAnalysisDescription" xlink:to="us-gaap_FairValueMeasurementsSensitivityAnalysisDescription_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PurchasesAndDrawdownsOfInvestments_lbl1" xml:lang="en-US">Purchases And Drawdowns Of Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PurchasesAndDrawdownsOfInvestments" xlink:to="muzi_PurchasesAndDrawdownsOfInvestments_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentInterestRateFloor_lbl0" xml:lang="en-US">Investment, Interest Rate, Floor</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentInterestRateFloor" xlink:to="us-gaap_InvestmentInterestRateFloor_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncentiveFeeDescription_lbl0" xml:lang="en-US">Incentive Fee, Description</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncentiveFeeDescription" xlink:to="us-gaap_IncentiveFeeDescription_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EarningsPerShareTextBlock_lbl0" xml:lang="en-US">Earnings Per Share [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EarningsPerShareTextBlock" xlink:to="us-gaap_EarningsPerShareTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_UnrealizedEarningsLossesnet_lbl1" xml:lang="en-US">Unrealized Earnings Lossesnet</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_UnrealizedEarningsLossesnet" xlink:to="muzi_UnrealizedEarningsLossesnet_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_OutstandingSharesPercentage_lbl1" xml:lang="en-US">Outstanding Shares Percentage</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OutstandingSharesPercentage" xlink:to="muzi_OutstandingSharesPercentage_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare_lbl1" xml:lang="en-US">Common Stock, Par or Stated Value Per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockParOrStatedValuePerShare" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionDate_lbl0" xml:lang="en-US">Distribution Made to Limited Liability Company (LLC) Member, Distribution Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionDate" xlink:to="us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberDistributionDate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ManagementFeePayable_lbl0" xml:lang="en-US">Management Fee Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ManagementFeePayable" xlink:to="us-gaap_ManagementFeePayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_EquityInvestmentsPreferredStockMember_lbl1" xml:lang="en-US">Equity Investments Preferred Stock Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsPreferredStockMember" xlink:to="muzi_EquityInvestmentsPreferredStockMember_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PlacementAgentAgreementMember_lbl0" xml:lang="en-US">Placement Agent Agreement Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PlacementAgentAgreementMember" xlink:to="muzi_PlacementAgentAgreementMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyDistributionPolicyTextBlock_lbl0" xml:lang="en-US">Investment Company, Distribution [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributionPolicyTextBlock" xlink:to="us-gaap_InvestmentCompanyDistributionPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock_lbl1" xml:lang="en-US">Schedule Of Net Change In Unrealized Appreciationdepreciation Table Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock" xlink:to="muzi_ScheduleOfNetChangeInUnrealizedAppreciationdepreciationTableTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommonStockSharesIssued_lbl0" xml:lang="en-US">Common Stock, Shares, Issued</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommonStockSharesIssued" xlink:to="us-gaap_CommonStockSharesIssued_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_SeniorSecuredLoanDebtInvestmentsMember_lbl2" xml:lang="en-US">Senior Secured Loan Debt Investments Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInvestmentsMember" xlink:to="muzi_SeniorSecuredLoanDebtInvestmentsMember_lbl2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl0" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" xlink:to="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DistributionsToStockholdersPolicyTextBlock_lbl1" xml:lang="en-US">Distributions To Stockholders Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionsToStockholdersPolicyTextBlock" xlink:to="muzi_DistributionsToStockholdersPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl1" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Diluted</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:to="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_FairValueSignificantUnobservableRangeInput_lbl1" xml:lang="en-US">Fair Value Significant Unobservable Range Input</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueSignificantUnobservableRangeInput" xlink:to="muzi_FairValueSignificantUnobservableRangeInput_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetExpensesOperating_lbl1" xml:lang="en-US">Net Expenses Operating</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetExpensesOperating" xlink:to="muzi_NetExpensesOperating_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLlcMemberByDistributionTableTextBlock_lbl0" xml:lang="en-US">Distributions Made to Limited Liability Company (LLC) Member, by Distribution [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLlcMemberByDistributionTableTextBlock" xlink:to="us-gaap_DistributionsMadeToLimitedLiabilityCompanyLlcMemberByDistributionTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaymentsOfCapitalDistribution_lbl0" xml:lang="en-US">Payments of Capital Distribution</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentsOfCapitalDistribution" xlink:to="us-gaap_PaymentsOfCapitalDistribution_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_WaiverOfBaseManagementFees_lbl1" xml:lang="en-US">Waiver Of Base Management Fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_WaiverOfBaseManagementFees" xlink:to="muzi_WaiverOfBaseManagementFees_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueDisclosuresTextBlock_lbl0" xml:lang="en-US">Fair Value Disclosures [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueDisclosuresTextBlock" xlink:to="us-gaap_FairValueDisclosuresTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLoss_lbl2" xml:lang="en-US">Net Income (Loss) Attributable to Parent</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_NetIncomeLoss_lbl2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_FundAccountingAgreementMember_lbl0" xml:lang="en-US">Fund Accounting Agreement Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FundAccountingAgreementMember" xlink:to="muzi_FundAccountingAgreementMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses_lbl1" xml:lang="en-US">Percentage Of Capital Gains In Excess Of Capital Losses</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses" xlink:to="muzi_PercentageOfCapitalGainsInExcessOfCapitalLosses_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyMember_lbl0" xml:lang="en-US">Related Party [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyMember" xlink:to="us-gaap_RelatedPartyMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsNet_lbl1" xml:lang="en-US">Net Assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AssetsNet" xlink:to="us-gaap_AssetsNet_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DebtInstrumentFaceAmount_lbl0" xml:lang="en-US">Debt Instrument, Face Amount</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentFaceAmount" xlink:to="us-gaap_DebtInstrumentFaceAmount_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_lbl0" xml:lang="en-US">Increase (Decrease) in Accounts and Other Receivables</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables" xlink:to="us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_Cash_lbl0" xml:lang="en-US">Cash</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_Cash" xlink:to="us-gaap_Cash_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfUnfundedCommitmentsToProvideDebtFinancingAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfUnfundedCommitmentsToProvideDebtFinancingAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfUnfundedCommitmentsToProvideDebtFinancingAbstract_lbl" xml:lang="en-US">Schedule Of Unfunded Commitments To Provide Debt Financing Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfUnfundedCommitmentsToProvideDebtFinancingAbstract" xlink:to="muzi_ScheduleOfUnfundedCommitmentsToProvideDebtFinancingAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentTableTextBlock_lbl0" xml:lang="en-US">Investment [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentTableTextBlock" xlink:to="us-gaap_InvestmentTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyPortfolioTurnover_lbl0" xml:lang="en-US">Investment Company, Portfolio Turnover</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyPortfolioTurnover" xlink:to="us-gaap_InvestmentCompanyPortfolioTurnover_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_SeniorSecuredLoanDebtInvestmentsNonLiquidTwoMember_lbl0" xml:lang="en-US">Senior Secured Loan Debt Investments Non Liquid Two Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInvestmentsNonLiquidTwoMember" xlink:to="muzi_SeniorSecuredLoanDebtInvestmentsNonLiquidTwoMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ConsolidationPolicyTextBlock_lbl0" xml:lang="en-US">Consolidation, Policy [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ConsolidationPolicyTextBlock" xlink:to="us-gaap_ConsolidationPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShare_lbl0" xml:lang="en-US">Investment Company, Gain (Loss) on Investment, Per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShare" xlink:to="us-gaap_InvestmentCompanyGainLossOnInvestmentPerShare_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl0" xml:lang="en-US">Commitments and Contingencies Disclosure [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:to="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl0" xml:lang="en-US">Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_CableSatelliteTVMember_lbl0" xml:lang="en-US">Cable Satellite TVMember</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CableSatelliteTVMember" xlink:to="muzi_CableSatelliteTVMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SharesOutstanding_lbl0" xml:lang="en-US">Shares, Outstanding</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SharesOutstanding" xlink:to="us-gaap_SharesOutstanding_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DistributionsReinvested_lbl1" xml:lang="en-US">Distributions Reinvested</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionsReinvested" xlink:to="muzi_DistributionsReinvested_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RetainedEarningsUnappropriated_lbl0" xml:lang="en-US">Retained Earnings, Unappropriated</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RetainedEarningsUnappropriated" xlink:to="us-gaap_RetainedEarningsUnappropriated_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetRegulatoryAssetsAbstract_lbl0" xml:lang="en-US">Net Regulatory Assets [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_NetRegulatoryAssetsAbstract" xlink:to="us-gaap_NetRegulatoryAssetsAbstract_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfInvestmentsBasedOnFairValueAsAPercentageOfNetAssetsAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfInvestmentsBasedOnFairValueAsAPercentageOfNetAssetsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfInvestmentsBasedOnFairValueAsAPercentageOfNetAssetsAbstract_lbl" xml:lang="en-US">Schedule Of Investments Based On Fair Value As APercentage Of Net Assets Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfInvestmentsBasedOnFairValueAsAPercentageOfNetAssetsAbstract" xlink:to="muzi_ScheduleOfInvestmentsBasedOnFairValueAsAPercentageOfNetAssetsAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl0" xml:lang="en-US">Liabilities and Equity</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LiabilitiesAndStockholdersEquity" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract_lbl0" xml:lang="en-US">Realized Gain (Loss), Investment and Derivative, Operating, before Tax [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract" xlink:to="us-gaap_RealizedGainLossInvestmentAndDerivativeOperatingBeforeTaxAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentOwnedPercentOfNetAssets_lbl2" xml:lang="en-US">Investment Owned, Net Assets, Percentage</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedPercentOfNetAssets" xlink:to="us-gaap_InvestmentOwnedPercentOfNetAssets_lbl2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_VLNCInfrastructureIncMember_lbl0" xml:lang="en-US">VLNCInfrastructure Inc Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_VLNCInfrastructureIncMember" xlink:to="muzi_VLNCInfrastructureIncMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ProceedsFromAdvanceShareSubscriptionAmount_lbl1" xml:lang="en-US">Proceeds From Advance Share Subscription Amount</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ProceedsFromAdvanceShareSubscriptionAmount" xlink:to="muzi_ProceedsFromAdvanceShareSubscriptionAmount_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_SeniorSecuredLoanDebtInstrumentsMember_lbl0" xml:lang="en-US">Senior Secured Loan Debt Instruments Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInstrumentsMember" xlink:to="muzi_SeniorSecuredLoanDebtInstrumentsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityPeriodIncreaseDecrease_lbl0" xml:lang="en-US">Stockholders&apos; Equity, Period Increase (Decrease)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityPeriodIncreaseDecrease" xlink:to="us-gaap_StockholdersEquityPeriodIncreaseDecrease_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription_lbl0" xml:lang="en-US">Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription" xlink:to="us-gaap_SegmentReportingCodmProfitLossMeasureHowUsedDescription_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AnnualManagementBaseRateFee_lbl1" xml:lang="en-US">Annual Management Base Rate Fee</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AnnualManagementBaseRateFee" xlink:to="muzi_AnnualManagementBaseRateFee_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyIncentiveAllocationToAverageNetAssets_lbl0" xml:lang="en-US">Investment Company, Incentive Allocation to Average Net Assets, Percentage</label>
<!-- [WMV7][ydexaJ+RBPRRO+cH5BDR+6JUCm886zlZ8wl4IFTjSsfaCYLPAT5xxWX75LwOOtrTVyTjq2O1BN8415/jBrYgxmE86cthT5DlVklJiMDudXgJIlXQ08WukcwUoNdPE2VQtNIL1UW/2xO04o7Xn/gpSgkSplDVWQsgmDUNNafzN1kay57Zb+tOjyGVv8fCEZs1EtkH3oUq15mUJAfpUqvhwcNlpOiMuKIThRAfgH3gBezO0F/eIqSQruMq+HpF4wsEEyZbS3eXVjizoXEm2UYjm7zBrI0CClrHGW0kFlzAJ/r0oW9D9OGsVXieGzokSYnjiXAulDelkHb+Q7RDFythTjLV2OV9MVBR1b1tgZjwjUhiRCENpcQLHtLTunEveVM1IknTv0CJ7ydObuvknuKO0sU=] CSR-->
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyIncentiveAllocationToAverageNetAssets" xlink:to="us-gaap_InvestmentCompanyIncentiveAllocationToAverageNetAssets_lbl0"/>
  </labelLink>
</linkbase>
