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<!-- Created: Thu Aug 13 18:42:18 UTC 2026 -->
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    <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>
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    <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"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RelatedPartyTransactionsAbstract_lbl" xml:lang="en-US">Agreements and 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"/>
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    <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"/>
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    <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_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"/>
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    <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_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"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InvestmentOwnedAtFairValue_lbl2" 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_InvestmentOwnedAtFairValue" xlink:to="us-gaap_InvestmentOwnedAtFairValue_lbl2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:label="us-gaap_InvestmentOwnedAtFairValue_lbl3" 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_InvestmentOwnedAtFairValue" xlink:to="us-gaap_InvestmentOwnedAtFairValue_lbl3"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueByMeasurementBasisAxis" xlink:to="us-gaap_FairValueByMeasurementBasisAxis_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ValuationTechniqueAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ValuationTechniqueAxis_lbl" xml:lang="en-US">Valuation Approach and Technique [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ValuationTechniqueAxis" xlink:to="us-gaap_ValuationTechniqueAxis_lbl"/>
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    <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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetRegulatoryAssetsAbstract_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_NetRegulatoryAssetsAbstract" xlink:to="us-gaap_NetRegulatoryAssetsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LineOfCreditFacilityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityAbstract_lbl" xml:lang="en-US">Borrowings from Credit Facility [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityAbstract" xlink:to="us-gaap_LineOfCreditFacilityAbstract_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityIncreaseDecreaseNetAbstract" xlink:to="us-gaap_LineOfCreditFacilityIncreaseDecreaseNetAbstract_lbl"/>
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    <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_NetIncomeLossAvailableToCommonStockholdersBasicAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_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_NetIncomeLossAvailableToCommonStockholdersBasicAbstract" xlink:to="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_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"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfFinancialHighlightsAbstract_lbl" xml:lang="en-US">Schedule of Financial Highlights [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfFinancialHighlightsAbstract" xlink:to="muzi_ScheduleOfFinancialHighlightsAbstract_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"/>
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    <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="muzi_SalesOfUnregisteredEquitySecuritiesMember" xlink:href="muzi-20260630.xsd#muzi_SalesOfUnregisteredEquitySecuritiesMember"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SalesOfUnregisteredEquitySecuritiesMember" xlink:to="muzi_SalesOfUnregisteredEquitySecuritiesMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IssuerPurchasesOfEquitySecuritiesMember" xlink:href="muzi-20260630.xsd#muzi_IssuerPurchasesOfEquitySecuritiesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IssuerPurchasesOfEquitySecuritiesMember_lbl" xml:lang="en-US">Issuer Purchases of Equity Securities [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IssuerPurchasesOfEquitySecuritiesMember" xlink:to="muzi_IssuerPurchasesOfEquitySecuritiesMember_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">Par Value</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"/>
    <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_InterestReceivableAndOtherAssets" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestReceivableAndOtherAssets"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestReceivableAndOtherAssets_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_InterestReceivableAndOtherAssets" xlink:to="us-gaap_InterestReceivableAndOtherAssets_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xml:lang="en-US">Other assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsNoncurrent" xlink:to="us-gaap_OtherAssetsNoncurrent_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_LineOfCredit" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LineOfCredit_lbl" xml:lang="en-US">Credit facility (Note 9)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCredit" xlink:to="us-gaap_LineOfCredit_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_LineOfCredit_lbl0" xml:lang="en-US">Borrowings amount</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCredit" xlink:to="us-gaap_LineOfCredit_lbl0"/>
    <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="muzi_DirectorsFeesPayable" xlink:href="muzi-20260630.xsd#muzi_DirectorsFeesPayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DirectorsFeesPayable_lbl" xml:lang="en-US">Directors&apos; fees payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DirectorsFeesPayable" xlink:to="muzi_DirectorsFeesPayable_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"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_DistributionPayable_lbl0" 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_DistributionPayable" xlink:to="us-gaap_DistributionPayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/netLabel" xlink:label="us-gaap_DistributionPayable_lbl1" 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_lbl1"/>
    <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="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="muzi_UnlabeledAbstract" xlink:href="muzi-20260630.xsd#muzi_UnlabeledAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_UnlabeledAbstract_lbl" xml:lang="en-US"></label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_UnlabeledAbstract" xlink:to="muzi_UnlabeledAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingencies" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xml:lang="en-US">Commitments and Contingencies (Note 5)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsAndContingencies" xlink:to="us-gaap_CommitmentsAndContingencies_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_StockholdersEquityAbstract_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_StockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquityAbstract_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; 500,000 shares authorized, 169,101.0 and 169,101.0 shares issued and outstanding as of June 30, 2026 and December 31, 2025, respectively</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"/>
    <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_InvestmentIncomeNetAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeNetAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentIncomeNetAbstract_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_InvestmentIncomeNetAbstract" xlink:to="us-gaap_InvestmentIncomeNetAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncomeLossFromContinuingOperationsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncomeLossFromContinuingOperationsAbstract_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="us-gaap_IncomeLossFromContinuingOperationsAbstract" xlink:to="us-gaap_IncomeLossFromContinuingOperationsAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_IncomeLossFromContinuingOperationsAbstract_lbl0" xml:lang="en-US">Investment income from affiliated investments:</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeLossFromContinuingOperationsAbstract" xlink:to="us-gaap_IncomeLossFromContinuingOperationsAbstract_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_FeeIncome" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FeeIncome"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_FeeIncome_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_FeeIncome" xlink:to="us-gaap_FeeIncome_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InterestIncomeOperatingPaidInCash" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeOperatingPaidInCash"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestIncomeOperatingPaidInCash_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_InterestIncomeOperatingPaidInCash" xlink:to="us-gaap_InterestIncomeOperatingPaidInCash_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"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_InvestmentIncomeInterest_lbl0" 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_lbl0"/>
    <loc xlink:type="locator" xlink:label="us-gaap_OperatingExpensesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpensesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_OperatingExpensesAbstract_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_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingExpensesAbstract_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"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ManagementFeeExpense_lbl0" xml:lang="en-US">Management fee</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"/>
    <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_InterestExpenseOperating" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestExpenseOperating_lbl" xml:lang="en-US">Interest expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestExpenseOperating" xlink:to="us-gaap_InterestExpenseOperating_lbl"/>
    <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_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="muzi_NetRealizedGainsLossesOnInvestmentsAbstract" xlink:href="muzi-20260630.xsd#muzi_NetRealizedGainsLossesOnInvestmentsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NetRealizedGainsLossesOnInvestmentsAbstract_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="muzi_NetRealizedGainsLossesOnInvestmentsAbstract" xlink:to="muzi_NetRealizedGainsLossesOnInvestmentsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetRealizedGainsLossesNoncontrollednonaffiliatedInvestments" xlink:href="muzi-20260630.xsd#muzi_NetRealizedGainsLossesNoncontrollednonaffiliatedInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NetRealizedGainsLossesNoncontrollednonaffiliatedInvestments_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_NetRealizedGainsLossesNoncontrollednonaffiliatedInvestments" xlink:to="muzi_NetRealizedGainsLossesNoncontrollednonaffiliatedInvestments_lbl"/>
    <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/terseLabel" xlink:label="us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNetAbstract_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_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNetAbstract" xlink:to="us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNetAbstract_lbl"/>
    <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/2003/role/terseLabel" 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="muzi_AffiliatedInvestments" xlink:href="muzi-20260630.xsd#muzi_AffiliatedInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AffiliatedInvestments_lbl" xml:lang="en-US">Affiliated investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AffiliatedInvestments" xlink:to="muzi_AffiliatedInvestments_lbl"/>
    <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_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/(Decrease) 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/(Decrease) 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 &#8211; 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 - 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">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_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_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/totalLabel" xlink:label="us-gaap_StockholdersEquityPeriodIncreaseDecrease_lbl" xml:lang="en-US">Total Increase/(Decrease) 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_DividendPayableAmountPerShare" xlink:href="muzi-20260630.xsd#muzi_DividendPayableAmountPerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DividendPayableAmountPerShare_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_DividendPayableAmountPerShare" xlink:to="muzi_DividendPayableAmountPerShare_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="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_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="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_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&apos; 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_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_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="us-gaap_IncreaseDecreaseInProfessionalFeePayable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInProfessionalFeePayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncreaseDecreaseInProfessionalFeePayable_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_IncreaseDecreaseInProfessionalFeePayable" xlink:to="us-gaap_IncreaseDecreaseInProfessionalFeePayable_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="us-gaap_ProceedsFromLinesOfCredit" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ProceedsFromLinesOfCredit_lbl" xml:lang="en-US">Borrowings on credit facility</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ProceedsFromLinesOfCredit" xlink:to="us-gaap_ProceedsFromLinesOfCredit_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable" xlink:href="muzi-20260630.xsd#muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable_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="muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable" xlink:to="muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable_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_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="us-gaap_InterestPaidNet" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPaidNet"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InterestPaidNet_lbl" xml:lang="en-US">Cash paid during the period for interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestPaidNet" xlink:to="us-gaap_InterestPaidNet_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_SeniorSecuredLoanDebtInvestments4Abstract" xlink:href="muzi-20260630.xsd#muzi_SeniorSecuredLoanDebtInvestments4Abstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_SeniorSecuredLoanDebtInvestments4Abstract_lbl" xml:lang="en-US">Senior Secured Loan Debt Investments(4)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInvestments4Abstract" xlink:to="muzi_SeniorSecuredLoanDebtInvestments4Abstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AutomotiveAbstract" xlink:href="muzi-20260630.xsd#muzi_AutomotiveAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AutomotiveAbstract_lbl" xml:lang="en-US">Automotive</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract" xlink:to="muzi_AutomotiveAbstract_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 Dates</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 held 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_lbl1"/>
    <loc xlink:type="locator" xlink:label="muzi_CommercialBuildingProductsAbstract" xlink:href="muzi-20260630.xsd#muzi_CommercialBuildingProductsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CommercialBuildingProductsAbstract_lbl" xml:lang="en-US">Commercial Building Products</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CommercialBuildingProductsAbstract" xlink:to="muzi_CommercialBuildingProductsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IndustrialMachineryAbstract" xlink:href="muzi-20260630.xsd#muzi_IndustrialMachineryAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IndustrialMachineryAbstract_lbl" xml:lang="en-US">Industrial Machinery</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IndustrialMachineryAbstract" xlink:to="muzi_IndustrialMachineryAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ItConsultingAbstract" xlink:href="muzi-20260630.xsd#muzi_ItConsultingAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ItConsultingAbstract_lbl" xml:lang="en-US">IT Consulting</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ItConsultingAbstract" xlink:to="muzi_ItConsultingAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LeisureFacilitiesAbstract" xlink:href="muzi-20260630.xsd#muzi_LeisureFacilitiesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LeisureFacilitiesAbstract_lbl" xml:lang="en-US">Leisure Facilities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureFacilitiesAbstract" xlink:to="muzi_LeisureFacilitiesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LeisureProductsAbstract" xlink:href="muzi-20260630.xsd#muzi_LeisureProductsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LeisureProductsAbstract_lbl" xml:lang="en-US">Leisure Products</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureProductsAbstract" xlink:to="muzi_LeisureProductsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PackagedFoodsMeatsAbstract" xlink:href="muzi-20260630.xsd#muzi_PackagedFoodsMeatsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PackagedFoodsMeatsAbstract_lbl" xml:lang="en-US">Packaged Foods &amp; Meats</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PackagedFoodsMeatsAbstract" xlink:to="muzi_PackagedFoodsMeatsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_EquityInvestmentsCommonStock812Abstract" xlink:href="muzi-20260630.xsd#muzi_EquityInvestmentsCommonStock812Abstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_EquityInvestmentsCommonStock812Abstract_lbl" xml:lang="en-US">Equity Investments - Common Stock(8)(12)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsCommonStock812Abstract" xlink:to="muzi_EquityInvestmentsCommonStock812Abstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ApparelAccessoriesLuxuryGoodsAbstract" xlink:href="muzi-20260630.xsd#muzi_ApparelAccessoriesLuxuryGoodsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ApparelAccessoriesLuxuryGoodsAbstract_lbl" xml:lang="en-US">Apparel, Accessories &amp; Luxury Goods</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ApparelAccessoriesLuxuryGoodsAbstract" xlink:to="muzi_ApparelAccessoriesLuxuryGoodsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AutomotiveAbstract0" xlink:href="muzi-20260630.xsd#muzi_AutomotiveAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AutomotiveAbstract0_lbl" xml:lang="en-US">Automotive</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract0" xlink:to="muzi_AutomotiveAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CommercialBuildingProductsAbstract0" xlink:href="muzi-20260630.xsd#muzi_CommercialBuildingProductsAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CommercialBuildingProductsAbstract0_lbl" xml:lang="en-US">Commercial Building Products</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CommercialBuildingProductsAbstract0" xlink:to="muzi_CommercialBuildingProductsAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ItConsultingAbstract0" xlink:href="muzi-20260630.xsd#muzi_ItConsultingAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ItConsultingAbstract0_lbl" xml:lang="en-US">IT Consulting</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ItConsultingAbstract0" xlink:to="muzi_ItConsultingAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LeisureFacilitiesAbstract0" xlink:href="muzi-20260630.xsd#muzi_LeisureFacilitiesAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LeisureFacilitiesAbstract0_lbl" xml:lang="en-US">Leisure Facilities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureFacilitiesAbstract0" xlink:to="muzi_LeisureFacilitiesAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PackagedFoodsMeatsAbstract0" xlink:href="muzi-20260630.xsd#muzi_PackagedFoodsMeatsAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PackagedFoodsMeatsAbstract0_lbl" xml:lang="en-US">Packaged Foods &amp; Meats</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PackagedFoodsMeatsAbstract0" xlink:to="muzi_PackagedFoodsMeatsAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_EquityInvestmentsPreferredStock12Abstract" xlink:href="muzi-20260630.xsd#muzi_EquityInvestmentsPreferredStock12Abstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_EquityInvestmentsPreferredStock12Abstract_lbl" xml:lang="en-US">Equity Investments - Preferred Stock(12)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsPreferredStock12Abstract" xlink:to="muzi_EquityInvestmentsPreferredStock12Abstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AutomotiveAbstract1" xlink:href="muzi-20260630.xsd#muzi_AutomotiveAbstract1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AutomotiveAbstract1_lbl" xml:lang="en-US">Automotive</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract1" xlink:to="muzi_AutomotiveAbstract1_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DiversifiedSupportServicesAbstract" xlink:href="muzi-20260630.xsd#muzi_DiversifiedSupportServicesAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DiversifiedSupportServicesAbstract_lbl" xml:lang="en-US">Diversified Support Services</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiversifiedSupportServicesAbstract" xlink:to="muzi_DiversifiedSupportServicesAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IndustrialMachineryAbstract0" xlink:href="muzi-20260630.xsd#muzi_IndustrialMachineryAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IndustrialMachineryAbstract0_lbl" xml:lang="en-US">Industrial Machinery</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IndustrialMachineryAbstract0" xlink:to="muzi_IndustrialMachineryAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LeisureProductsAbstract0" xlink:href="muzi-20260630.xsd#muzi_LeisureProductsAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LeisureProductsAbstract0_lbl" xml:lang="en-US">Leisure Products</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureProductsAbstract0" xlink:to="muzi_LeisureProductsAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PackagedFoodsMeatsAbstract1" xlink:href="muzi-20260630.xsd#muzi_PackagedFoodsMeatsAbstract1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PackagedFoodsMeatsAbstract1_lbl" xml:lang="en-US">Packaged Foods &amp; Meats</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PackagedFoodsMeatsAbstract1" xlink:to="muzi_PackagedFoodsMeatsAbstract1_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ShortTermInvestmentsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShortTermInvestmentsAbstract_lbl" xml:lang="en-US">Short-Term Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermInvestmentsAbstract" xlink:to="us-gaap_ShortTermInvestmentsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_SeniorSecuredLoanDebtInvestments4Abstract0" xlink:href="muzi-20260630.xsd#muzi_SeniorSecuredLoanDebtInvestments4Abstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_SeniorSecuredLoanDebtInvestments4Abstract0_lbl" xml:lang="en-US">Senior Secured Loan Debt Investments(4)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SeniorSecuredLoanDebtInvestments4Abstract0" xlink:to="muzi_SeniorSecuredLoanDebtInvestments4Abstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ApparelAccessoriesLuxuryGoodsAbstract0" xlink:href="muzi-20260630.xsd#muzi_ApparelAccessoriesLuxuryGoodsAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ApparelAccessoriesLuxuryGoodsAbstract0_lbl" xml:lang="en-US">Apparel, Accessories &amp; Luxury Goods</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ApparelAccessoriesLuxuryGoodsAbstract0" xlink:to="muzi_ApparelAccessoriesLuxuryGoodsAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AutomotiveAbstract2" xlink:href="muzi-20260630.xsd#muzi_AutomotiveAbstract2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AutomotiveAbstract2_lbl" xml:lang="en-US">Automotive</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract2" xlink:to="muzi_AutomotiveAbstract2_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CommercialBuildingProductsAbstract1" xlink:href="muzi-20260630.xsd#muzi_CommercialBuildingProductsAbstract1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CommercialBuildingProductsAbstract1_lbl" xml:lang="en-US">Commercial Building Products</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CommercialBuildingProductsAbstract1" xlink:to="muzi_CommercialBuildingProductsAbstract1_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ComputerAndElectronicsRetailAbstract" xlink:href="muzi-20260630.xsd#muzi_ComputerAndElectronicsRetailAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ComputerAndElectronicsRetailAbstract_lbl" xml:lang="en-US">Computer and Electronics Retail</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ComputerAndElectronicsRetailAbstract" xlink:to="muzi_ComputerAndElectronicsRetailAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IndustrialMachineryAbstract1" xlink:href="muzi-20260630.xsd#muzi_IndustrialMachineryAbstract1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IndustrialMachineryAbstract1_lbl" xml:lang="en-US">Industrial Machinery</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IndustrialMachineryAbstract1" xlink:to="muzi_IndustrialMachineryAbstract1_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ItConsultingAbstract1" xlink:href="muzi-20260630.xsd#muzi_ItConsultingAbstract1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ItConsultingAbstract1_lbl" xml:lang="en-US">IT Consulting</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ItConsultingAbstract1" xlink:to="muzi_ItConsultingAbstract1_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LeisureFacilitiesAbstract1" xlink:href="muzi-20260630.xsd#muzi_LeisureFacilitiesAbstract1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LeisureFacilitiesAbstract1_lbl" xml:lang="en-US">Leisure Facilities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureFacilitiesAbstract1" xlink:to="muzi_LeisureFacilitiesAbstract1_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LeisureProductsAbstract1" xlink:href="muzi-20260630.xsd#muzi_LeisureProductsAbstract1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LeisureProductsAbstract1_lbl" xml:lang="en-US">Leisure Products</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureProductsAbstract1" xlink:to="muzi_LeisureProductsAbstract1_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PackagedFoodsMeatsAbstract2" xlink:href="muzi-20260630.xsd#muzi_PackagedFoodsMeatsAbstract2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PackagedFoodsMeatsAbstract2_lbl" xml:lang="en-US">Packaged Foods &amp; Meats</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PackagedFoodsMeatsAbstract2" xlink:to="muzi_PackagedFoodsMeatsAbstract2_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_EquityInvestmentsCommonStock812Abstract0" xlink:href="muzi-20260630.xsd#muzi_EquityInvestmentsCommonStock812Abstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_EquityInvestmentsCommonStock812Abstract0_lbl" xml:lang="en-US">Equity Investments - Common Stock(8),(12)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsCommonStock812Abstract0" xlink:to="muzi_EquityInvestmentsCommonStock812Abstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ApparelAccessoriesLuxuryGoodsAbstract1" xlink:href="muzi-20260630.xsd#muzi_ApparelAccessoriesLuxuryGoodsAbstract1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ApparelAccessoriesLuxuryGoodsAbstract1_lbl" xml:lang="en-US">Apparel, Accessories &amp; Luxury Goods</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ApparelAccessoriesLuxuryGoodsAbstract1" xlink:to="muzi_ApparelAccessoriesLuxuryGoodsAbstract1_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AutomotiveAbstract3" xlink:href="muzi-20260630.xsd#muzi_AutomotiveAbstract3"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AutomotiveAbstract3_lbl" xml:lang="en-US">Automotive</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract3" xlink:to="muzi_AutomotiveAbstract3_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CommercialBuildingProductsAbstract2" xlink:href="muzi-20260630.xsd#muzi_CommercialBuildingProductsAbstract2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CommercialBuildingProductsAbstract2_lbl" xml:lang="en-US">Commercial Building Products</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CommercialBuildingProductsAbstract2" xlink:to="muzi_CommercialBuildingProductsAbstract2_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ComputerAndElectronicsRetailAbstract0" xlink:href="muzi-20260630.xsd#muzi_ComputerAndElectronicsRetailAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ComputerAndElectronicsRetailAbstract0_lbl" xml:lang="en-US">Computer and Electronics Retail</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ComputerAndElectronicsRetailAbstract0" xlink:to="muzi_ComputerAndElectronicsRetailAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ItConsultingAbstract2" xlink:href="muzi-20260630.xsd#muzi_ItConsultingAbstract2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ItConsultingAbstract2_lbl" xml:lang="en-US">IT Consulting</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ItConsultingAbstract2" xlink:to="muzi_ItConsultingAbstract2_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LeisureFacilitiesAbstract2" xlink:href="muzi-20260630.xsd#muzi_LeisureFacilitiesAbstract2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LeisureFacilitiesAbstract2_lbl" xml:lang="en-US">Leisure Facilities</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureFacilitiesAbstract2" xlink:to="muzi_LeisureFacilitiesAbstract2_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PackagedFoodsMeatsAbstract3" xlink:href="muzi-20260630.xsd#muzi_PackagedFoodsMeatsAbstract3"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PackagedFoodsMeatsAbstract3_lbl" xml:lang="en-US">Packaged Foods &amp; Meats</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PackagedFoodsMeatsAbstract3" xlink:to="muzi_PackagedFoodsMeatsAbstract3_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_EquityInvestmentsPreferredStock12Abstract0" xlink:href="muzi-20260630.xsd#muzi_EquityInvestmentsPreferredStock12Abstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_EquityInvestmentsPreferredStock12Abstract0_lbl" xml:lang="en-US">Equity Investments - Preferred Stock(12)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsPreferredStock12Abstract0" xlink:to="muzi_EquityInvestmentsPreferredStock12Abstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AutomotiveAbstract4" xlink:href="muzi-20260630.xsd#muzi_AutomotiveAbstract4"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AutomotiveAbstract4_lbl" xml:lang="en-US">Automotive</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract4" xlink:to="muzi_AutomotiveAbstract4_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DiversifiedSupportServicesAbstract0" xlink:href="muzi-20260630.xsd#muzi_DiversifiedSupportServicesAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DiversifiedSupportServicesAbstract0_lbl" xml:lang="en-US">Diversified Support Services</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiversifiedSupportServicesAbstract0" xlink:to="muzi_DiversifiedSupportServicesAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IndustrialMachineryAbstract2" xlink:href="muzi-20260630.xsd#muzi_IndustrialMachineryAbstract2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IndustrialMachineryAbstract2_lbl" xml:lang="en-US">Industrial Machinery</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IndustrialMachineryAbstract2" xlink:to="muzi_IndustrialMachineryAbstract2_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LeisureProductsAbstract2" xlink:href="muzi-20260630.xsd#muzi_LeisureProductsAbstract2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LeisureProductsAbstract2_lbl" xml:lang="en-US">Leisure Products</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureProductsAbstract2" xlink:to="muzi_LeisureProductsAbstract2_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PackagedFoodsMeatsAbstract4" xlink:href="muzi-20260630.xsd#muzi_PackagedFoodsMeatsAbstract4"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PackagedFoodsMeatsAbstract4_lbl" xml:lang="en-US">Packaged Foods &amp; Meats</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PackagedFoodsMeatsAbstract4" xlink:to="muzi_PackagedFoodsMeatsAbstract4_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ShortTermInvestmentsAbstract0" xlink:href="muzi-20260630.xsd#muzi_ShortTermInvestmentsAbstract0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ShortTermInvestmentsAbstract0_lbl" xml:lang="en-US">Short-Term Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ShortTermInvestmentsAbstract0" xlink:to="muzi_ShortTermInvestmentsAbstract0_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MoneyMarketFundsAbstract" xlink:href="muzi-20260630.xsd#muzi_MoneyMarketFundsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MoneyMarketFundsAbstract_lbl" xml:lang="en-US">Money Market Funds</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MoneyMarketFundsAbstract" xlink:to="muzi_MoneyMarketFundsAbstract_lbl"/>
    <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/negatedLabel" xlink:label="us-gaap_InvestmentCompanyDividendDistribution_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_InvestmentCompanyDividendDistribution" xlink:to="us-gaap_InvestmentCompanyDividendDistribution_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NetIncomeFromPaymentinkindInterest" xlink:href="muzi-20260630.xsd#muzi_NetIncomeFromPaymentinkindInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="muzi_NetIncomeFromPaymentinkindInterest_lbl" xml:lang="en-US">Net (income)/expenses from payment-in-kind interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetIncomeFromPaymentinkindInterest" xlink:to="muzi_NetIncomeFromPaymentinkindInterest_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NetIncomeFromPaymentinkindInterest_lbl0" 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_NetIncomeFromPaymentinkindInterest" xlink:to="muzi_NetIncomeFromPaymentinkindInterest_lbl0"/>
    <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"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_lbl0" xml:lang="en-US">Net accretion of discount (amortization of premium) on 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"/>
    <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_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/2009/role/negatedLabel" xlink:label="us-gaap_RealizedInvestmentGainsLosses_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_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">Realized Gain (Loss)</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"/>
    <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_RepaymentsOfLinesOfCredit" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="us-gaap_RepaymentsOfLinesOfCredit_lbl" xml:lang="en-US">Payments on credit facility</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RepaymentsOfLinesOfCredit" xlink:to="us-gaap_RepaymentsOfLinesOfCredit_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentAffiliatedIssuerMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentAffiliatedIssuerMember_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="us-gaap_InvestmentAffiliatedIssuerMember" xlink:to="us-gaap_InvestmentAffiliatedIssuerMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentUnaffiliatedIssuerMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentUnaffiliatedIssuerMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentUnaffiliatedIssuerMember_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="us-gaap_InvestmentUnaffiliatedIssuerMember" xlink:to="us-gaap_InvestmentUnaffiliatedIssuerMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_lbl" xml:lang="en-US">Affiliated Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" xlink:to="us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NonControlNonAffiliateInvestmentsMember" xlink:href="muzi-20260630.xsd#muzi_NonControlNonAffiliateInvestmentsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NonControlNonAffiliateInvestmentsMember_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_NonControlNonAffiliateInvestmentsMember" xlink:to="muzi_NonControlNonAffiliateInvestmentsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AffiliatedInvestmentsMember" xlink:href="muzi-20260630.xsd#muzi_AffiliatedInvestmentsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AffiliatedInvestmentsMember_lbl" xml:lang="en-US">Affiliated Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AffiliatedInvestmentsMember" xlink:to="muzi_AffiliatedInvestmentsMember_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">Net assets [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_InvestmentHoldingsScheduleOfInvestmentsTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentHoldingsScheduleOfInvestmentsTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentHoldingsScheduleOfInvestmentsTableTextBlock_lbl" xml:lang="en-US">Schedule of Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentHoldingsScheduleOfInvestmentsTableTextBlock" xlink:to="us-gaap_InvestmentHoldingsScheduleOfInvestmentsTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentType" xlink:href="muzi-20260630.xsd#muzi_InvestmentType"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentType_lbl" xml:lang="en-US">Investment Type</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentType" xlink:to="muzi_InvestmentType_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentIncomeContractualRate" xlink:href="muzi-20260630.xsd#muzi_InvestmentIncomeContractualRate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentIncomeContractualRate_lbl" xml:lang="en-US">Contractual Rate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentIncomeContractualRate" xlink:to="muzi_InvestmentIncomeContractualRate_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentOwnedContractualRatePercentage" xlink:href="muzi-20260630.xsd#muzi_InvestmentOwnedContractualRatePercentage"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentOwnedContractualRatePercentage_lbl" xml:lang="en-US">Contractual Rate, percentage</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentOwnedContractualRatePercentage" xlink:to="muzi_InvestmentOwnedContractualRatePercentage_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentIncomeInvestmentExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentIncomeInvestmentExpense_lbl" xml:lang="en-US">Interest Income Foregone</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeInvestmentExpense" xlink:to="us-gaap_InvestmentIncomeInvestmentExpense_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xml:lang="en-US">Income Taxes</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxDisclosureTextBlock" xlink:to="us-gaap_IncomeTaxDisclosureTextBlock_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 Distribution</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_RecordDate" xlink:href="muzi-20260630.xsd#muzi_RecordDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_RecordDate_lbl" xml:lang="en-US">Record Date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RecordDate" xlink:to="muzi_RecordDate_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PaymentDate" xlink:href="muzi-20260630.xsd#muzi_PaymentDate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PaymentDate_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_PaymentDate" xlink:to="muzi_PaymentDate_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DistributionRatePerShare" xlink:href="muzi-20260630.xsd#muzi_DistributionRatePerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DistributionRatePerShare_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="muzi_DistributionRatePerShare" xlink:to="muzi_DistributionRatePerShare_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="muzi_CapitalLossCarryforwardAbstract" xlink:href="muzi-20260630.xsd#muzi_CapitalLossCarryforwardAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CapitalLossCarryforwardAbstract_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="muzi_CapitalLossCarryforwardAbstract" xlink:to="muzi_CapitalLossCarryforwardAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedLongTermCapitalGainLoss" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedLongTermCapitalGainLoss"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedLongTermCapitalGainLoss_lbl" xml:lang="en-US">Perpetual long-term capital loss carryforward</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedLongTermCapitalGainLoss" xlink:to="us-gaap_InvestmentCompanyDistributableEarningsLossAccumulatedLongTermCapitalGainLoss_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss" xlink:href="muzi-20260630.xsd#muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss_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_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss" xlink:to="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss_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 Cost 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"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_TaxBasisOfInvestmentsCostForIncomeTaxPurposes_lbl0" xml:lang="en-US">Cost of investments (in Dollars)</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"/>
    <loc xlink:type="locator" xlink:label="muzi_GrossUnrealizedAppreciationOnInvestments" xlink:href="muzi-20260630.xsd#muzi_GrossUnrealizedAppreciationOnInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_GrossUnrealizedAppreciationOnInvestments_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="muzi_GrossUnrealizedAppreciationOnInvestments" xlink:to="muzi_GrossUnrealizedAppreciationOnInvestments_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 Total Distributable (Accumulated) Earnings/(Losses) and 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_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalOther"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_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_AdjustmentsToAdditionalPaidInCapitalOther" xlink:to="us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_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">Agreements and 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_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock_lbl" xml:lang="en-US">Schedule of Affiliated Companies</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock" xlink:to="us-gaap_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentCompanyAcquisitions" xlink:href="muzi-20260630.xsd#muzi_InvestmentCompanyAcquisitions"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentCompanyAcquisitions_lbl" xml:lang="en-US">Acquisitions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyAcquisitions" xlink:to="muzi_InvestmentCompanyAcquisitions_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentCompanyofDispositions" xlink:href="muzi-20260630.xsd#muzi_InvestmentCompanyofDispositions"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentCompanyofDispositions_lbl" xml:lang="en-US">Dispositions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyofDispositions" xlink:to="muzi_InvestmentCompanyofDispositions_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentCompanyofAccretion" xlink:href="muzi-20260630.xsd#muzi_InvestmentCompanyofAccretion"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentCompanyofAccretion_lbl" xml:lang="en-US">Accretion</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyofAccretion" xlink:to="muzi_InvestmentCompanyofAccretion_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ChangeInUnrealizedAppreciationDepreciation" xlink:href="muzi-20260630.xsd#muzi_ChangeInUnrealizedAppreciationDepreciation"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ChangeInUnrealizedAppreciationDepreciation_lbl" xml:lang="en-US">Change in Unrealized Appreciation/ (Depreciation)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ChangeInUnrealizedAppreciationDepreciation" xlink:to="muzi_ChangeInUnrealizedAppreciationDepreciation_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PaidInKindInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaidInKindInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PaidInKindInterest_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_PaidInKindInterest" xlink:to="us-gaap_PaidInKindInterest_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentOwnedBalanceShares" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedBalanceShares"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentOwnedBalanceShares_lbl" xml:lang="en-US">Shares (in Shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedBalanceShares" xlink:to="us-gaap_InvestmentOwnedBalanceShares_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentIncomeDividend" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentIncomeDividend"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentIncomeDividend_lbl" xml:lang="en-US">Dividend Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeDividend" xlink:to="us-gaap_InvestmentIncomeDividend_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>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfChangesInTheFairValueOfInvestmentsTableTextBlock" xlink:to="muzi_ScheduleOfChangesInTheFairValueOfInvestmentsTableTextBlock_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>
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    <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/2003/role/terseLabel" 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/2003/role/terseLabel" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_lbl" xml:lang="en-US">Net realized 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="muzi_NetChangeInUnrealizedAppreciationdepreciation" xlink:href="muzi-20260630.xsd#muzi_NetChangeInUnrealizedAppreciationdepreciation"/>
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    <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="srt_ScheduleOfCondensedIncomeStatementTableTextBlock" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScheduleOfCondensedIncomeStatementTableTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="srt_ScheduleOfCondensedIncomeStatementTableTextBlock_lbl" xml:lang="en-US">Schedule of Net Change in Unrealized Appreciation (Depreciation)</label>
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    <loc xlink:type="locator" xlink:label="muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique" xlink:href="muzi-20260630.xsd#muzi_InvestmentCompanyInvestmentOwnedFairValueValuationTechnique"/>
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    <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"/>
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    <loc xlink:type="locator" xlink:label="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercent" xlink:href="muzi-20260630.xsd#muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercent"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercentWeightedAverageInputs" xlink:to="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercentWeightedAverageInputs_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"/>
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    <loc xlink:type="locator" xlink:label="us-gaap_DividendsDeclaredTableTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsDeclaredTableTextBlock"/>
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    <loc xlink:type="locator" xlink:label="muzi_DistributionsAndComponentsOfNetAssetsOnTaxBasisPayableDate" xlink:href="muzi-20260630.xsd#muzi_DistributionsAndComponentsOfNetAssetsOnTaxBasisPayableDate"/>
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    <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"/>
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    <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"/>
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    <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="us-gaap_DebtDisclosureTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtDisclosureTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtDisclosureTextBlock_lbl" xml:lang="en-US">Borrowings from Credit Facility</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtDisclosureTextBlock" xlink:to="us-gaap_DebtDisclosureTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock_lbl" xml:lang="en-US">Schedule of Credit Facility Activity</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock" xlink:to="us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LineOfCreditFacilityAverageOutstandingAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityAverageOutstandingAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LineOfCreditFacilityAverageOutstandingAmount_lbl" xml:lang="en-US">Outstanding balance as of period-end</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityAverageOutstandingAmount" xlink:to="us-gaap_LineOfCreditFacilityAverageOutstandingAmount_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:to="us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityIncreaseAccruedInterest" xlink:to="us-gaap_LineOfCreditFacilityIncreaseAccruedInterest_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"/>
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    <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"/>
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    <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 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="muzi_PerCommonShareOperatingPerformanceAbstract" xlink:href="muzi-20260630.xsd#muzi_PerCommonShareOperatingPerformanceAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PerCommonShareOperatingPerformanceAbstract_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="muzi_PerCommonShareOperatingPerformanceAbstract" xlink:to="muzi_PerCommonShareOperatingPerformanceAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ResultsOfOperationsAbstract" xlink:href="muzi-20260630.xsd#muzi_ResultsOfOperationsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ResultsOfOperationsAbstract_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="muzi_ResultsOfOperationsAbstract" xlink:to="muzi_ResultsOfOperationsAbstract_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/totalLabel" 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="muzi_DistributionsToCommonStockholdersAbstract" xlink:href="muzi-20260630.xsd#muzi_DistributionsToCommonStockholdersAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DistributionsToCommonStockholdersAbstract_lbl" 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="muzi_DistributionsToCommonStockholdersAbstract" xlink:to="muzi_DistributionsToCommonStockholdersAbstract_lbl"/>
    <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/terseLabel" 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="muzi_RatioSupplementalDataAbstract" xlink:href="muzi-20260630.xsd#muzi_RatioSupplementalDataAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_RatioSupplementalDataAbstract_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="muzi_RatioSupplementalDataAbstract" xlink:to="muzi_RatioSupplementalDataAbstract_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="us-gaap_WeightedAverageNumberOfSharesIssuedBasic" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesIssuedBasic"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_WeightedAverageNumberOfSharesIssuedBasic_lbl" xml:lang="en-US">Weighted average shares outstanding (in Shares)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_WeightedAverageNumberOfSharesIssuedBasic" xlink:to="us-gaap_WeightedAverageNumberOfSharesIssuedBasic_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/terseLabel" 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_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="us-gaap_InvestmentCompanyTotalReturnPaymentByAffiliateLossOnInvestmentInViolation" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanyTotalReturnPaymentByAffiliateLossOnInvestmentInViolation"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyTotalReturnPaymentByAffiliateLossOnInvestmentInViolation_lbl" xml:lang="en-US">Ratio of total expenses to average net assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyTotalReturnPaymentByAffiliateLossOnInvestmentInViolation" xlink:to="us-gaap_InvestmentCompanyTotalReturnPaymentByAffiliateLossOnInvestmentInViolation_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_RatioOfNetInvestmentIncomelossToAverageNetAssetsWithoutReimbursement" xlink:href="muzi-20260630.xsd#muzi_RatioOfNetInvestmentIncomelossToAverageNetAssetsWithoutReimbursement"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_RatioOfNetInvestmentIncomelossToAverageNetAssetsWithoutReimbursement_lbl" xml:lang="en-US">Ratio of net investment income/(loss) to average net assets</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RatioOfNetInvestmentIncomelossToAverageNetAssetsWithoutReimbursement" xlink:to="muzi_RatioOfNetInvestmentIncomelossToAverageNetAssetsWithoutReimbursement_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AssetCoverageRatioWithoutReimbursement" xlink:href="muzi-20260630.xsd#muzi_AssetCoverageRatioWithoutReimbursement"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AssetCoverageRatioWithoutReimbursement_lbl" xml:lang="en-US">Asset coverage ratio</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AssetCoverageRatioWithoutReimbursement" xlink:to="muzi_AssetCoverageRatioWithoutReimbursement_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="muzi_GrossUnrealizedDepreciationOnInvestments" xlink:href="muzi-20260630.xsd#muzi_GrossUnrealizedDepreciationOnInvestments"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="muzi_GrossUnrealizedDepreciationOnInvestments_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="muzi_GrossUnrealizedDepreciationOnInvestments" xlink:to="muzi_GrossUnrealizedDepreciationOnInvestments_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"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanyDistributionToShareholdersPerShare_lbl0" 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_InvestmentCompanyDistributionToShareholdersPerShare" xlink:to="us-gaap_InvestmentCompanyDistributionToShareholdersPerShare_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare" xlink:href="muzi-20260630.xsd#muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:label="muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare_lbl" xml:lang="en-US">Decrease in Net Assets Resulting from Distributions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare" xlink:to="muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PortfolioCompanyMember" xlink:href="muzi-20260630.xsd#muzi_PortfolioCompanyMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PortfolioCompanyMember_lbl" xml:lang="en-US">Portfolio Company [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PortfolioCompanyMember" xlink:to="muzi_PortfolioCompanyMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_QuestBidcoGoApeLLCMember" xlink:href="muzi-20260630.xsd#muzi_QuestBidcoGoApeLLCMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_QuestBidcoGoApeLLCMember_lbl" xml:lang="en-US">Quest Bidco (GoApe) LLC [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QuestBidcoGoApeLLCMember" xlink:to="muzi_QuestBidcoGoApeLLCMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_QuestBidcoGoApeLLCOneMember" xlink:href="muzi-20260630.xsd#muzi_QuestBidcoGoApeLLCOneMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_QuestBidcoGoApeLLCOneMember_lbl" xml:lang="en-US">Quest Bidco (GoApe) LLC [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QuestBidcoGoApeLLCOneMember" xlink:to="muzi_QuestBidcoGoApeLLCOneMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCMember" xlink:href="muzi-20260630.xsd#muzi_MidwestTradingGroupAcquisitionLLCMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCMember_lbl" xml:lang="en-US">Midwest Trading Group Acquisition, LLC [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MidwestTradingGroupAcquisitionLLCMember" xlink:to="muzi_MidwestTradingGroupAcquisitionLLCMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AquaLeisureRecreationLLCTwoMember" xlink:href="muzi-20260630.xsd#muzi_AquaLeisureRecreationLLCTwoMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AquaLeisureRecreationLLCTwoMember_lbl" xml:lang="en-US">Aqua Leisure Recreational [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AquaLeisureRecreationLLCTwoMember" xlink:to="muzi_AquaLeisureRecreationLLCTwoMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AquaLeisureRecreationLLCThreeMember" xlink:href="muzi-20260630.xsd#muzi_AquaLeisureRecreationLLCThreeMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AquaLeisureRecreationLLCThreeMember_lbl" xml:lang="en-US">Aqua Leisure Recreational [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AquaLeisureRecreationLLCThreeMember" xlink:to="muzi_AquaLeisureRecreationLLCThreeMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_May82026Member" xlink:href="muzi-20260630.xsd#muzi_May82026Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_May82026Member_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_May82026Member" xlink:to="muzi_May82026Member_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_March212025Member" xlink:href="muzi-20260630.xsd#muzi_March212025Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_March212025Member_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_March212025Member" xlink:to="muzi_March212025Member_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_May132025Member" xlink:href="muzi-20260630.xsd#muzi_May132025Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_May132025Member_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_May132025Member" xlink:to="muzi_May132025Member_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentsMember_lbl" xml:lang="en-US">Investments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentsMember" xlink:to="us-gaap_InvestmentsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AquaLeisureRecreationLLCSecondLienTermLoanMember" xlink:href="muzi-20260630.xsd#muzi_AquaLeisureRecreationLLCSecondLienTermLoanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AquaLeisureRecreationLLCSecondLienTermLoanMember_lbl" xml:lang="en-US">Aqua Leisure Recreation, LLC Second Lien Term Loan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AquaLeisureRecreationLLCSecondLienTermLoanMember" xlink:to="muzi_AquaLeisureRecreationLLCSecondLienTermLoanMember_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"/>
    <loc xlink:type="locator" xlink:label="muzi_DiamondBladeWarehouseLLCFirstLienTermLoanMember" xlink:href="muzi-20260630.xsd#muzi_DiamondBladeWarehouseLLCFirstLienTermLoanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DiamondBladeWarehouseLLCFirstLienTermLoanMember_lbl" xml:lang="en-US">Diamond Blade Warehouse LLC First Lien Term Loan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiamondBladeWarehouseLLCFirstLienTermLoanMember" xlink:to="muzi_DiamondBladeWarehouseLLCFirstLienTermLoanMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_QuestBidcoGoApeLLCFirstLienDelayedDrawTermLoanMember" xlink:href="muzi-20260630.xsd#muzi_QuestBidcoGoApeLLCFirstLienDelayedDrawTermLoanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_QuestBidcoGoApeLLCFirstLienDelayedDrawTermLoanMember_lbl" xml:lang="en-US">Quest Bidco (GoApe) LLC First Lien Delayed Draw Term Loan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QuestBidcoGoApeLLCFirstLienDelayedDrawTermLoanMember" xlink:to="muzi_QuestBidcoGoApeLLCFirstLienDelayedDrawTermLoanMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_QuestBidcoGoApeLLCSuperSeniorPriorityTermLoanMember" xlink:href="muzi-20260630.xsd#muzi_QuestBidcoGoApeLLCSuperSeniorPriorityTermLoanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_QuestBidcoGoApeLLCSuperSeniorPriorityTermLoanMember_lbl" xml:lang="en-US">Quest Bidco (GoApe) LLC Super Senior Priority Term Loan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QuestBidcoGoApeLLCSuperSeniorPriorityTermLoanMember" xlink:to="muzi_QuestBidcoGoApeLLCSuperSeniorPriorityTermLoanMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_RecreationalProductsConsolidationCompanyLLCPromissoryNoteMember" xlink:href="muzi-20260630.xsd#muzi_RecreationalProductsConsolidationCompanyLLCPromissoryNoteMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_RecreationalProductsConsolidationCompanyLLCPromissoryNoteMember_lbl" xml:lang="en-US">Recreational Products Consolidation Company, LLC Promissory Note [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RecreationalProductsConsolidationCompanyLLCPromissoryNoteMember" xlink:to="muzi_RecreationalProductsConsolidationCompanyLLCPromissoryNoteMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_QUESTJVCOLIMITEDClassACommonStockMember" xlink:href="muzi-20260630.xsd#muzi_QUESTJVCOLIMITEDClassACommonStockMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_QUESTJVCOLIMITEDClassACommonStockMember_lbl" xml:lang="en-US">QUEST JVCO LIMITED Common Stock Class A [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QUESTJVCOLIMITEDClassACommonStockMember" xlink:to="muzi_QUESTJVCOLIMITEDClassACommonStockMember_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">Equity Investments - 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"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" 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="muzi_QUESTJVCOLIMITEDCommonStockMember" xlink:href="muzi-20260630.xsd#muzi_QUESTJVCOLIMITEDCommonStockMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_QUESTJVCOLIMITEDCommonStockMember_lbl" xml:lang="en-US">QUEST JVCO LIMITED Common Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QUESTJVCOLIMITEDCommonStockMember" xlink:to="muzi_QUESTJVCOLIMITEDCommonStockMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DiamondBladeWarehouseLLCPreferredStockClassATwoMember" xlink:href="muzi-20260630.xsd#muzi_DiamondBladeWarehouseLLCPreferredStockClassATwoMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DiamondBladeWarehouseLLCPreferredStockClassATwoMember_lbl" xml:lang="en-US">Diamond Blade Warehouse LLC Preferred Stock &#8211; Class A [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiamondBladeWarehouseLLCPreferredStockClassATwoMember" xlink:to="muzi_DiamondBladeWarehouseLLCPreferredStockClassATwoMember_lbl"/>
    <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_RecreationalProductsHoldingCompanyLLCPreferredStockClassBMember" xlink:href="muzi-20260630.xsd#muzi_RecreationalProductsHoldingCompanyLLCPreferredStockClassBMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_RecreationalProductsHoldingCompanyLLCPreferredStockClassBMember_lbl" xml:lang="en-US">Recreational Products Holding Company, LLC Preferred Stock &#8211; Class B [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RecreationalProductsHoldingCompanyLLCPreferredStockClassBMember" xlink:to="muzi_RecreationalProductsHoldingCompanyLLCPreferredStockClassBMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_TotalAffiliatesMember" xlink:href="muzi-20260630.xsd#muzi_TotalAffiliatesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_TotalAffiliatesMember_lbl" xml:lang="en-US">Total Affiliates [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TotalAffiliatesMember" xlink:to="muzi_TotalAffiliatesMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCFirstLienTermLoanMember" xlink:href="muzi-20260630.xsd#muzi_MidwestTradingGroupAcquisitionLLCFirstLienTermLoanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCFirstLienTermLoanMember_lbl" xml:lang="en-US">Midwest Trading Group Acquisition, LLC First Lien Term Loan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MidwestTradingGroupAcquisitionLLCFirstLienTermLoanMember" xlink:to="muzi_MidwestTradingGroupAcquisitionLLCFirstLienTermLoanMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DiamondBladeWarehouseFirstLienTermLoanMember" xlink:href="muzi-20260630.xsd#muzi_DiamondBladeWarehouseFirstLienTermLoanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DiamondBladeWarehouseFirstLienTermLoanMember_lbl" xml:lang="en-US">Diamond Blade Warehouse First Lien Term Loan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiamondBladeWarehouseFirstLienTermLoanMember" xlink:to="muzi_DiamondBladeWarehouseFirstLienTermLoanMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_QuestBidcoGoApeLLCSecondLienTermLoanMember" xlink:href="muzi-20260630.xsd#muzi_QuestBidcoGoApeLLCSecondLienTermLoanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_QuestBidcoGoApeLLCSecondLienTermLoanMember_lbl" xml:lang="en-US">Quest Bidco (GoApe) LLC Second Lien Term Loan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QuestBidcoGoApeLLCSecondLienTermLoanMember" xlink:to="muzi_QuestBidcoGoApeLLCSecondLienTermLoanMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_QuestBidcoLLCSecondLienTermLoanMember" xlink:href="muzi-20260630.xsd#muzi_QuestBidcoLLCSecondLienTermLoanMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_QuestBidcoLLCSecondLienTermLoanMember_lbl" xml:lang="en-US">Quest Bidco LLC Second Lien Term Loan [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QuestBidcoLLCSecondLienTermLoanMember" xlink:to="muzi_QuestBidcoLLCSecondLienTermLoanMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCClassA1Member" xlink:href="muzi-20260630.xsd#muzi_MidwestTradingGroupAcquisitionLLCClassA1Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCClassA1Member_lbl" xml:lang="en-US">Midwest Trading Group Acquisition, LLC Class A-1 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MidwestTradingGroupAcquisitionLLCClassA1Member" xlink:to="muzi_MidwestTradingGroupAcquisitionLLCClassA1Member_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCClassA3Member" xlink:href="muzi-20260630.xsd#muzi_MidwestTradingGroupAcquisitionLLCClassA3Member"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCClassA3Member_lbl" xml:lang="en-US">Midwest Trading Group Acquisition, LLC Class A-3 [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MidwestTradingGroupAcquisitionLLCClassA3Member" xlink:to="muzi_MidwestTradingGroupAcquisitionLLCClassA3Member_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCClassCMember" xlink:href="muzi-20260630.xsd#muzi_MidwestTradingGroupAcquisitionLLCClassCMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCClassCMember_lbl" xml:lang="en-US">Midwest Trading Group Acquisition, LLC Class C [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MidwestTradingGroupAcquisitionLLCClassCMember" xlink:to="muzi_MidwestTradingGroupAcquisitionLLCClassCMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_QUESTJVCOLIMITEDClassAMember" xlink:href="muzi-20260630.xsd#muzi_QUESTJVCOLIMITEDClassAMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_QUESTJVCOLIMITEDClassAMember_lbl" xml:lang="en-US">QUEST JVCO LIMITED - Class A [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QUESTJVCOLIMITEDClassAMember" xlink:to="muzi_QUESTJVCOLIMITEDClassAMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_QUESTJVCOLIMITEDLoanNotesMember" xlink:href="muzi-20260630.xsd#muzi_QUESTJVCOLIMITEDLoanNotesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_QUESTJVCOLIMITEDLoanNotesMember_lbl" xml:lang="en-US">QUEST JVCO LIMITED - Loan Notes [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QUESTJVCOLIMITEDLoanNotesMember" xlink:to="muzi_QUESTJVCOLIMITEDLoanNotesMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_DiamondBladeWarehouseMember" xlink:href="muzi-20260630.xsd#muzi_DiamondBladeWarehouseMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_DiamondBladeWarehouseMember_lbl" xml:lang="en-US">Diamond Blade Warehouse [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiamondBladeWarehouseMember" xlink:to="muzi_DiamondBladeWarehouseMember_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_EquityInvestmentsCommonStockMember" xlink:href="muzi-20260630.xsd#muzi_EquityInvestmentsCommonStockMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_EquityInvestmentsCommonStockMember_lbl" xml:lang="en-US">Equity Investments - Common Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsCommonStockMember" xlink:to="muzi_EquityInvestmentsCommonStockMember_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 - 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 &#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_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_MoneyMarketFundMember" xlink:href="muzi-20260630.xsd#muzi_MoneyMarketFundMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MoneyMarketFundMember_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="muzi_MoneyMarketFundMember" xlink:to="muzi_MoneyMarketFundMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_UnitedStatesTreasuryBillMember" xlink:href="muzi-20260630.xsd#muzi_UnitedStatesTreasuryBillMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_UnitedStatesTreasuryBillMember_lbl" xml:lang="en-US">United States Treasury Bill [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_UnitedStatesTreasuryBillMember" xlink:to="muzi_UnitedStatesTreasuryBillMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LeisureProductsMember" xlink:href="muzi-20260630.xsd#muzi_LeisureProductsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LeisureProductsMember_lbl" xml:lang="en-US">Leisure Products [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureProductsMember" xlink:to="muzi_LeisureProductsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PackagedFoodsMeatsMember" xlink:href="muzi-20260630.xsd#muzi_PackagedFoodsMeatsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PackagedFoodsMeatsMember_lbl" xml:lang="en-US">Packaged Foods &amp; Meats [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PackagedFoodsMeatsMember" xlink:to="muzi_PackagedFoodsMeatsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_AutomotiveMember" xlink:href="muzi-20260630.xsd#muzi_AutomotiveMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AutomotiveMember_lbl" xml:lang="en-US">Automotive [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveMember" xlink:to="muzi_AutomotiveMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_CommercialBuildingProductsMember" xlink:href="muzi-20260630.xsd#muzi_CommercialBuildingProductsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CommercialBuildingProductsMember_lbl" xml:lang="en-US">Commercial Building Products [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CommercialBuildingProductsMember" xlink:to="muzi_CommercialBuildingProductsMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_IndustrialMachineryMember" xlink:href="muzi-20260630.xsd#muzi_IndustrialMachineryMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_IndustrialMachineryMember_lbl" xml:lang="en-US">Industrial Machinery [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IndustrialMachineryMember" xlink:to="muzi_IndustrialMachineryMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ITConsultingMember" xlink:href="muzi-20260630.xsd#muzi_ITConsultingMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ITConsultingMember_lbl" xml:lang="en-US">IT Consulting [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ITConsultingMember" xlink:to="muzi_ITConsultingMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LeisureFacilitiesMember" xlink:href="muzi-20260630.xsd#muzi_LeisureFacilitiesMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LeisureFacilitiesMember_lbl" xml:lang="en-US">Leisure Facilities [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureFacilitiesMember" xlink:to="muzi_LeisureFacilitiesMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ApparelAccessoriesLuxuryGoodsMember" xlink:href="muzi-20260630.xsd#muzi_ApparelAccessoriesLuxuryGoodsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ApparelAccessoriesLuxuryGoodsMember_lbl" xml:lang="en-US">Apparel, Accessories &amp; Luxury Goods [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ApparelAccessoriesLuxuryGoodsMember" xlink:to="muzi_ApparelAccessoriesLuxuryGoodsMember_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="muzi_EquityInvestmentCommonStockMember" xlink:href="muzi-20260630.xsd#muzi_EquityInvestmentCommonStockMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_EquityInvestmentCommonStockMember_lbl" xml:lang="en-US">Equity Investments &#8211; Common Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentCommonStockMember" xlink:to="muzi_EquityInvestmentCommonStockMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="muzi_EquityInvestmentCommonStockMember_lbl0" xml:lang="en-US">Equity Investments - Common Stock [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentCommonStockMember" xlink:to="muzi_EquityInvestmentCommonStockMember_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="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_ShortTermInvestmentsMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ShortTermInvestmentsMember_lbl" xml:lang="en-US">Short-Term Investments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermInvestmentsMember" xlink:to="us-gaap_ShortTermInvestmentsMember_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"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" 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"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ChangeDuringPeriodFairValueDisclosureMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeDuringPeriodFairValueDisclosureMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ChangeDuringPeriodFairValueDisclosureMember_lbl" xml:lang="en-US">Changes Measurement [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ChangeDuringPeriodFairValueDisclosureMember" xlink:to="us-gaap_ChangeDuringPeriodFairValueDisclosureMember_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ValuationTechniqueDiscountedCashFlowMember" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ValuationTechniqueDiscountedCashFlowMember_lbl" xml:lang="en-US">Discounted cash flow [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ValuationTechniqueDiscountedCashFlowMember" xlink:to="us-gaap_ValuationTechniqueDiscountedCashFlowMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_ValuationTechniqueDiscountedCashFlowMember_lbl0" xml:lang="en-US">Valuation Technique Discounted Cash Flow [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ValuationTechniqueDiscountedCashFlowMember" xlink:to="us-gaap_ValuationTechniqueDiscountedCashFlowMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ValuationTechniqueRecentTransactionPriceMember" xlink:href="muzi-20260630.xsd#muzi_ValuationTechniqueRecentTransactionPriceMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ValuationTechniqueRecentTransactionPriceMember_lbl" xml:lang="en-US">Valuation Technique Recent Transaction Price [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ValuationTechniqueRecentTransactionPriceMember" xlink:to="muzi_ValuationTechniqueRecentTransactionPriceMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MarketApproachMember" xlink:href="muzi-20260630.xsd#muzi_MarketApproachMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MarketApproachMember_lbl" xml:lang="en-US">Valuation Technique Market approach [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MarketApproachMember" xlink:to="muzi_MarketApproachMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="muzi_MarketApproachMember_lbl0" xml:lang="en-US">Market approach [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MarketApproachMember" xlink:to="muzi_MarketApproachMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ContingentPaymentMember" xlink:href="muzi-20260630.xsd#muzi_ContingentPaymentMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ContingentPaymentMember_lbl" xml:lang="en-US">Valuation Technique Contingent Payment [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ContingentPaymentMember" xlink:to="muzi_ContingentPaymentMember_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_MayEightTwoThousandTwentySixMember" xlink:href="muzi-20260630.xsd#muzi_MayEightTwoThousandTwentySixMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MayEightTwoThousandTwentySixMember_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_MayEightTwoThousandTwentySixMember" xlink:to="muzi_MayEightTwoThousandTwentySixMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MarchTwentyOneTwoThousandTwentyFiveMember" xlink:href="muzi-20260630.xsd#muzi_MarchTwentyOneTwoThousandTwentyFiveMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MarchTwentyOneTwoThousandTwentyFiveMember_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_MarchTwentyOneTwoThousandTwentyFiveMember" xlink:to="muzi_MarchTwentyOneTwoThousandTwentyFiveMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MayThirteenTwoThousandTwentyFiveMember" xlink:href="muzi-20260630.xsd#muzi_MayThirteenTwoThousandTwentyFiveMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MayThirteenTwoThousandTwentyFiveMember_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_MayThirteenTwoThousandTwentyFiveMember" xlink:to="muzi_MayThirteenTwoThousandTwentyFiveMember_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_CreditFacilityAxis" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CreditFacilityAxis_lbl" xml:lang="en-US">Credit Facility [Axis]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityAxis_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="dei_EntityIncorporationDateOfIncorporation" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationDateOfIncorporation"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="dei_EntityIncorporationDateOfIncorporation_lbl" xml:lang="en-US">Corporation formed date</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityIncorporationDateOfIncorporation" xlink:to="dei_EntityIncorporationDateOfIncorporation_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_MinorityInterestOwnershipPercentageByParent_lbl" xml:lang="en-US">Subsidiary ownership percentage</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_MinorityInterestOwnershipPercentageByParent" xlink:to="us-gaap_MinorityInterestOwnershipPercentageByParent_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 balances</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_TotalAssetsPercentage" xlink:href="muzi-20260630.xsd#muzi_TotalAssetsPercentage"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_TotalAssetsPercentage_lbl" xml:lang="en-US">Total assets percentage</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TotalAssetsPercentage" xlink:to="muzi_TotalAssetsPercentage_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</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="muzi_NonAccrualInvestmentsAggregateAmortizedCost" xlink:href="muzi-20260630.xsd#muzi_NonAccrualInvestmentsAggregateAmortizedCost"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NonAccrualInvestmentsAggregateAmortizedCost_lbl" xml:lang="en-US">Non-accrual investments aggregate amortized cost</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NonAccrualInvestmentsAggregateAmortizedCost" xlink:to="muzi_NonAccrualInvestmentsAggregateAmortizedCost_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_NonAccrualInvestmentsAggregateFairValue" xlink:href="muzi-20260630.xsd#muzi_NonAccrualInvestmentsAggregateFairValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_NonAccrualInvestmentsAggregateFairValue_lbl" xml:lang="en-US">Non-accrual investments aggregate fair value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NonAccrualInvestmentsAggregateFairValue" xlink:to="muzi_NonAccrualInvestmentsAggregateFairValue_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PercentageOfNonAccrualInvestmentsAggregateAmortizedCost" xlink:href="muzi-20260630.xsd#muzi_PercentageOfNonAccrualInvestmentsAggregateAmortizedCost"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PercentageOfNonAccrualInvestmentsAggregateAmortizedCost_lbl" xml:lang="en-US">Percentage of amortized cost</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfNonAccrualInvestmentsAggregateAmortizedCost" xlink:to="muzi_PercentageOfNonAccrualInvestmentsAggregateAmortizedCost_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PercentageOfNonAccrualInvestmentsFairValue" xlink:href="muzi-20260630.xsd#muzi_PercentageOfNonAccrualInvestmentsFairValue"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PercentageOfNonAccrualInvestmentsFairValue_lbl" xml:lang="en-US">Percentage of fair value</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfNonAccrualInvestmentsFairValue" xlink:to="muzi_PercentageOfNonAccrualInvestmentsFairValue_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">Number of 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_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">Description of segment</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_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="muzi_PercentageOfInvestmentCompanyTaxableIncome" xlink:href="muzi-20260630.xsd#muzi_PercentageOfInvestmentCompanyTaxableIncome"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PercentageOfInvestmentCompanyTaxableIncome_lbl" xml:lang="en-US">Percentage of investment company taxable income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfInvestmentCompanyTaxableIncome" xlink:to="muzi_PercentageOfInvestmentCompanyTaxableIncome_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xml:lang="en-US">Federal tax rate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:to="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_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">Net ordinary income</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_CapitalGainLossesRate" xlink:href="muzi-20260630.xsd#muzi_CapitalGainLossesRate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_CapitalGainLossesRate_lbl" xml:lang="en-US">Capital gain losses rate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CapitalGainLossesRate" xlink:to="muzi_CapitalGainLossesRate_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ManagementAndServiceFeesRate" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ManagementAndServiceFeesRate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_ManagementAndServiceFeesRate_lbl" xml:lang="en-US">Management fees percentage</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ManagementAndServiceFeesRate" xlink:to="us-gaap_ManagementAndServiceFeesRate_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="us-gaap_AdministrativeFeesExpense" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdministrativeFeesExpense"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AdministrativeFeesExpense_lbl" xml:lang="en-US">Administrative fees expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdministrativeFeesExpense" xlink:to="us-gaap_AdministrativeFeesExpense_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_PaymentForAdministrativeFees" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentForAdministrativeFees"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PaymentForAdministrativeFees_lbl" xml:lang="en-US">Payment for administrative fees</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaymentForAdministrativeFees" xlink:to="us-gaap_PaymentForAdministrativeFees_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="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">Affiliated adviser held shares (in Shares)</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"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl0" xml:lang="en-US">Common stock issuance</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"/>
    <loc xlink:type="locator" xlink:label="muzi_InvestmentCompanyTotalReturnsPaymentToFundByAffiliate" xlink:href="muzi-20260630.xsd#muzi_InvestmentCompanyTotalReturnsPaymentToFundByAffiliate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_InvestmentCompanyTotalReturnsPaymentToFundByAffiliate_lbl" xml:lang="en-US">Percentage of outstanding shares held by affiliate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyTotalReturnsPaymentToFundByAffiliate" xlink:to="muzi_InvestmentCompanyTotalReturnsPaymentToFundByAffiliate_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="us-gaap_CommitmentsFairValueDisclosure" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsFairValueDisclosure"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_CommitmentsFairValueDisclosure_lbl" xml:lang="en-US">Unfunded commitments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_CommitmentsFairValueDisclosure" xlink:to="us-gaap_CommitmentsFairValueDisclosure_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_PercentageOfBorrowing" xlink:href="muzi-20260630.xsd#muzi_PercentageOfBorrowing"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PercentageOfBorrowing_lbl" xml:lang="en-US">Percentage of borrowing</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfBorrowing" xlink:to="muzi_PercentageOfBorrowing_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatio" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatio"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatio_lbl" xml:lang="en-US">Asset coverage ratio</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatio" xlink:to="us-gaap_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatio_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_lbl" xml:lang="en-US">Loan agreement amount (in Dollars)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_SubordinatedBorrowingInterestRate" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubordinatedBorrowingInterestRate"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_SubordinatedBorrowingInterestRate_lbl" xml:lang="en-US">Borrowing percentage</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubordinatedBorrowingInterestRate" xlink:to="us-gaap_SubordinatedBorrowingInterestRate_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DebtInstrumentTerm" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTerm"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DebtInstrumentTerm_lbl" xml:lang="en-US">Prior notice</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtInstrumentTerm" xlink:to="us-gaap_DebtInstrumentTerm_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl" xml:lang="en-US">Dilutive shares</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_DistributionMadeToLimitedPartnerDateOfRecord" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionMadeToLimitedPartnerDateOfRecord"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_DistributionMadeToLimitedPartnerDateOfRecord_lbl" xml:lang="en-US">Date of distribution payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributionMadeToLimitedPartnerDateOfRecord" xlink:to="us-gaap_DistributionMadeToLimitedPartnerDateOfRecord_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_PrincipalPaydownsPolicyPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_PrincipalPaydownsPolicyPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_PrincipalPaydownsPolicyPolicyTextBlock_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_PrincipalPaydownsPolicyPolicyTextBlock" xlink:to="muzi_PrincipalPaydownsPolicyPolicyTextBlock_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_OrganizationAndOfferingCostsPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_OrganizationAndOfferingCostsPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_OrganizationAndOfferingCostsPolicyTextBlock_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_OrganizationAndOfferingCostsPolicyTextBlock" xlink:to="muzi_OrganizationAndOfferingCostsPolicyTextBlock_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="us-gaap_RevenueRecognitionInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRecognitionInterest"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_RevenueRecognitionInterest_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="us-gaap_RevenueRecognitionInterest" xlink:to="us-gaap_RevenueRecognitionInterest_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 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_OtherIncomePolicyPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_OtherIncomePolicyPolicyTextBlock"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_OtherIncomePolicyPolicyTextBlock_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_OtherIncomePolicyPolicyTextBlock" xlink:to="muzi_OtherIncomePolicyPolicyTextBlock_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="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 to Stockholders</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="muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock" xlink:href="muzi-20260630.xsd#muzi_IdentificationOfNonAccrualInvestmentsPolicyTextBlock"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_PriorPeriodReclassificationAdjustmentDescription_lbl" xml:lang="en-US">Reclassifications</label>
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    <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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_AmericanInstituteOfCertifiedPublicAccountantsMember_lbl" xml:lang="en-US">American Institute of Certified Public Accountants [Member]</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_USFederalExciseTaxMember" xlink:to="muzi_USFederalExciseTaxMember_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_ManagementFeeMember_lbl" xml:lang="en-US">Management Fee [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ManagementFeeMember" xlink:to="muzi_ManagementFeeMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_MuzinichUSPrivateDebtSCSpMember" xlink:href="muzi-20260630.xsd#muzi_MuzinichUSPrivateDebtSCSpMember"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MuzinichUSPrivateDebtSCSpMember" xlink:to="muzi_MuzinichUSPrivateDebtSCSpMember_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_MuzinichCoMember_lbl" xml:lang="en-US">Muzinich &amp; Co [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MuzinichCoMember" xlink:to="muzi_MuzinichCoMember_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MuzinichCoMember" xlink:to="muzi_MuzinichCoMember_lbl0"/>
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    <loc xlink:type="locator" xlink:label="muzi_BNPParibasPrimeBrokerageInternationalLimitedMember" xlink:href="muzi-20260630.xsd#muzi_BNPParibasPrimeBrokerageInternationalLimitedMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_BNPParibasPrimeBrokerageInternationalLimitedMember_lbl" xml:lang="en-US">BNP Paribas Prime Brokerage International, Limited [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_BNPParibasPrimeBrokerageInternationalLimitedMember" xlink:to="muzi_BNPParibasPrimeBrokerageInternationalLimitedMember_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_LoanAgreementMember" xlink:href="muzi-20260630.xsd#muzi_LoanAgreementMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="muzi_LoanAgreementMember_lbl" xml:lang="en-US">Loan Agreement [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LoanAgreementMember" xlink:to="muzi_LoanAgreementMember_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="us-gaap_LineOfCreditMember_lbl" xml:lang="en-US">Credit Facility [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditMember" xlink:to="us-gaap_LineOfCreditMember_lbl"/>
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    <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"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIssuerAffiliationDomain_lbl" xml:lang="en-US">Investment, Issuer Affiliation [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIssuerAffiliationDomain" xlink:to="us-gaap_InvestmentIssuerAffiliationDomain_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="srt_OwnershipDomain" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_OwnershipDomain_lbl" xml:lang="en-US">Ownership [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_OwnershipDomain" xlink:to="srt_OwnershipDomain_lbl"/>
    <loc xlink:type="locator" xlink:label="srt_EquityMethodInvesteeNameDomain" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_EquityMethodInvesteeNameDomain_lbl" xml:lang="en-US">Investment, Name [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="srt_EquityMethodInvesteeNameDomain_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfInvestmentsTable_lbl" xml:lang="en-US">Schedule of Investments [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_ScheduleOfInvestmentsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfInvestmentsLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfInvestmentsLineItems_lbl" xml:lang="en-US">Schedule of Investments [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfInvestmentsLineItems_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="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"/>
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    <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="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable" xlink:to="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_EquityComponentDomain_lbl" xml:lang="en-US">Equity Component [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_EquityComponentDomain_lbl"/>
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    <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>
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    <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"/>
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    <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"/>
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    <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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_CondensedIncomeStatementTable_lbl" xml:lang="en-US">Condensed Income Statement [Table]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ValuationTechniqueDomain_lbl" xml:lang="en-US">Valuation Approach and Technique [Domain]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ValuationTechniqueDomain" xlink:to="us-gaap_ValuationTechniqueDomain_lbl"/>
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    <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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl" xml:lang="en-US">Fair Value Measurement Inputs and Valuation Techniques [Table]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl"/>
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    <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 Significant Unobservable Inputs [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"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyChangesInNetAssetsLineItems" xlink:to="us-gaap_InvestmentCompanyChangesInNetAssetsLineItems_lbl0"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_SummaryofSignificantAccountingPoliciesDetailsTable" xlink:to="muzi_SummaryofSignificantAccountingPoliciesDetailsTable_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StatutoryAccountingPracticesLineItems_lbl" xml:lang="en-US">Summary of Significant Accounting Policies [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StatutoryAccountingPracticesLineItems" xlink:to="us-gaap_StatutoryAccountingPracticesLineItems_lbl"/>
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    <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"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_IncomeTaxesDetailsTable" xlink:to="muzi_IncomeTaxesDetailsTable_lbl"/>
    <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxExaminationLineItems" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExaminationLineItems"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncomeTaxExaminationLineItems_lbl" xml:lang="en-US">Income Taxes [Line Items]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncomeTaxExaminationLineItems" xlink:to="us-gaap_IncomeTaxExaminationLineItems_lbl"/>
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    <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"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AgreementsandRelatedPartyTransactionsDetailsTable" xlink:to="muzi_AgreementsandRelatedPartyTransactionsDetailsTable_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="us-gaap_RelatedPartyTransactionLineItems_lbl0"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="srt_SegmentGeographicalDomain" xlink:to="srt_SegmentGeographicalDomain_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentsDetailsTable" xlink:to="muzi_InvestmentsDetailsTable_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyChangesInNetAssetsLineItems" xlink:to="us-gaap_InvestmentCompanyChangesInNetAssetsLineItems_lbl1"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NetAssetsDetailsTable" xlink:to="muzi_NetAssetsDetailsTable_lbl"/>
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    <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"/>
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    <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"/>
    <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">Represent the 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_AffiliatedInvestments_lbl0" xml:lang="en-US">Amount of affiliated investments.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AffiliatedInvestments" xlink:to="muzi_AffiliatedInvestments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_AssetCoverageRatioWithoutReimbursement_lbl0" xml:lang="en-US">Asset coverage ratio without reimbursement.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AssetCoverageRatioWithoutReimbursement" xlink:to="muzi_AssetCoverageRatioWithoutReimbursement_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_CapitalGainLossesRate_lbl0" xml:lang="en-US">Capital gain losses rate.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CapitalGainLossesRate" xlink:to="muzi_CapitalGainLossesRate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_ChangeInUnrealizedAppreciationDepreciation_lbl0" xml:lang="en-US">Change in Unrealized Appreciation/ Depreciation.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ChangeInUnrealizedAppreciationDepreciation" xlink:to="muzi_ChangeInUnrealizedAppreciationDepreciation_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_DealOriginationCostsPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of 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_DirectorsFeesPayable_lbl0" xml:lang="en-US">Amount of directors&apos; fees payable.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DirectorsFeesPayable" xlink:to="muzi_DirectorsFeesPayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_DistributionRatePerShare_lbl0" xml:lang="en-US">Represent the amount of distribution rate per share.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionRatePerShare" xlink:to="muzi_DistributionRatePerShare_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_DistributionsAndComponentsOfNetAssetsOnTaxBasisPayableDate_lbl0" xml:lang="en-US">Distributions and components of net assets on a tax basis, payable date.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionsAndComponentsOfNetAssetsOnTaxBasisPayableDate" xlink:to="muzi_DistributionsAndComponentsOfNetAssetsOnTaxBasisPayableDate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_DividendPayableAmountPerShare_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_DividendPayableAmountPerShare" xlink:to="muzi_DividendPayableAmountPerShare_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercent_lbl0" xml:lang="en-US">Percentage of inputs.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercent" xlink:to="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercent_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercentWeightedAverageInputs_lbl0" xml:lang="en-US">The percentage of weighted average inputs.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercentWeightedAverageInputs" xlink:to="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercentWeightedAverageInputs_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_GrossUnrealizedAppreciationOnInvestments_lbl0" xml:lang="en-US">This element represents the excess of the cost (face amount, notional amount) of an investment (security, contract) over its fair value which deficiency has not been recognized in earnings of the entity.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_GrossUnrealizedAppreciationOnInvestments" xlink:to="muzi_GrossUnrealizedAppreciationOnInvestments_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_GrossUnrealizedDepreciationOnInvestments_lbl0" xml:lang="en-US">This element represents the excess of the cost (face amount, notional amount) of an investment (security, contract) over its fair value which deficiency has not been recognized in earnings of the entity.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_GrossUnrealizedDepreciationOnInvestments" xlink:to="muzi_GrossUnrealizedDepreciationOnInvestments_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">Amount of director 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_InvestmentCompanyAcquisitions_lbl0" xml:lang="en-US">Amount of investment company acquisitions.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyAcquisitions" xlink:to="muzi_InvestmentCompanyAcquisitions_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLossNet_lbl0" xml:lang="en-US">Amount of accumulated undistributed earnings (deficit) from ordinary income (loss) of investment company.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLossNet" xlink:to="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedOrdinaryIncomeLossNet_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss_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_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss" xlink:to="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare_lbl0" xml:lang="en-US">Per share or unit amount of distribution to shareholders.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare" xlink:to="muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare_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_InvestmentCompanyTotalReturnsPaymentToFundByAffiliate_lbl0" xml:lang="en-US">Investment company total returns payment to fund by Affiliate.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyTotalReturnsPaymentToFundByAffiliate" xlink:to="muzi_InvestmentCompanyTotalReturnsPaymentToFundByAffiliate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentCompanyofAccretion_lbl0" xml:lang="en-US">Amount of investment of company accretion.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyofAccretion" xlink:to="muzi_InvestmentCompanyofAccretion_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentCompanyofDispositions_lbl0" xml:lang="en-US">Amount of investment company of dispositions.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyofDispositions" xlink:to="muzi_InvestmentCompanyofDispositions_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentIncomeContractualRate_lbl0" xml:lang="en-US">Contractual rate.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentIncomeContractualRate" xlink:to="muzi_InvestmentIncomeContractualRate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentOwnedContractualRatePercentage_lbl0" xml:lang="en-US">Contractual rate percentage.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentOwnedContractualRatePercentage" xlink:to="muzi_InvestmentOwnedContractualRatePercentage_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_InvestmentType_lbl0" xml:lang="en-US">The investment type.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentType" xlink:to="muzi_InvestmentType_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_MarketCapitalization_lbl0" 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_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_NetIncomeFromPaymentinkindInterest_lbl1" 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="muzi_NetIncomeFromPaymentinkindInterest" xlink:to="muzi_NetIncomeFromPaymentinkindInterest_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_NetRealizedGainsLossesNoncontrollednonaffiliatedInvestments_lbl0" xml:lang="en-US">Represents the 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_NetRealizedGainsLossesNoncontrollednonaffiliatedInvestments" xlink:to="muzi_NetRealizedGainsLossesNoncontrollednonaffiliatedInvestments_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_NonAccrualInvestmentsAggregateAmortizedCost_lbl0" xml:lang="en-US">The amount of non accrual investments aggregate amortized cost.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NonAccrualInvestmentsAggregateAmortizedCost" xlink:to="muzi_NonAccrualInvestmentsAggregateAmortizedCost_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_NonAccrualInvestmentsAggregateFairValue_lbl0" xml:lang="en-US">Represent the amount of non accrual investments aggregate fair value.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NonAccrualInvestmentsAggregateFairValue" xlink:to="muzi_NonAccrualInvestmentsAggregateFairValue_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_OrganizationAndOfferingCostsPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policy for organization and offering costs.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OrganizationAndOfferingCostsPolicyTextBlock" xlink:to="muzi_OrganizationAndOfferingCostsPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_OtherIncomePolicyPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policy for other income.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OtherIncomePolicyPolicyTextBlock" xlink:to="muzi_OtherIncomePolicyPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PaymentDate_lbl0" xml:lang="en-US">Payable date.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PaymentDate" xlink:to="muzi_PaymentDate_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 policy 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_PercentageOfBorrowing_lbl0" xml:lang="en-US">Percentage of borrowing.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfBorrowing" xlink:to="muzi_PercentageOfBorrowing_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PercentageOfInvestmentCompanyTaxableIncome_lbl0" xml:lang="en-US">Percentage of investment company taxable income.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfInvestmentCompanyTaxableIncome" xlink:to="muzi_PercentageOfInvestmentCompanyTaxableIncome_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PercentageOfNonAccrualInvestmentsAggregateAmortizedCost_lbl0" xml:lang="en-US">The percentage of non-accrual investments had an aggregate amortized cost.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfNonAccrualInvestmentsAggregateAmortizedCost" xlink:to="muzi_PercentageOfNonAccrualInvestmentsAggregateAmortizedCost_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_PercentageOfNonAccrualInvestmentsFairValue_lbl0" xml:lang="en-US">The percentage of non-accrual investments fair value.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PercentageOfNonAccrualInvestmentsFairValue" xlink:to="muzi_PercentageOfNonAccrualInvestmentsFairValue_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_PrincipalPaydownsPolicyPolicyTextBlock_lbl0" xml:lang="en-US">Disclosure of accounting policy for principal paydowns.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PrincipalPaydownsPolicyPolicyTextBlock" xlink:to="muzi_PrincipalPaydownsPolicyPolicyTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable_lbl0" xml:lang="en-US">Amount of distributions net of change in distributions payable.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable" xlink:to="muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable_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_RatioOfNetInvestmentIncomelossToAverageNetAssetsWithoutReimbursement_lbl0" xml:lang="en-US">Ratio of net investment income (loss) to average net assets without reimbursement.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RatioOfNetInvestmentIncomelossToAverageNetAssetsWithoutReimbursement" xlink:to="muzi_RatioOfNetInvestmentIncomelossToAverageNetAssetsWithoutReimbursement_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_RecordDate_lbl0" xml:lang="en-US">Record date.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RecordDate" xlink:to="muzi_RecordDate_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:label="muzi_ScheduleOfChangesInTheFairValueOfInvestmentsTableTextBlock_lbl0" xml:lang="en-US">Tabular disclosure of change in fair value of investments.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfChangesInTheFairValueOfInvestmentsTableTextBlock" xlink:to="muzi_ScheduleOfChangesInTheFairValueOfInvestmentsTableTextBlock_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_TotalAssetsPercentage_lbl0" xml:lang="en-US">Represents the total assets.</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_TotalAssetsPercentage" xlink:to="muzi_TotalAssetsPercentage_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_ITConsultingMember_lbl0" xml:lang="en-US">IT consulting [Member].</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ITConsultingMember" xlink:to="muzi_ITConsultingMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="srt_ExecutiveOfficerMember" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ExecutiveOfficerMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_ExecutiveOfficerMember_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_ExecutiveOfficerMember" xlink:to="srt_ExecutiveOfficerMember_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ShortTermInvestmentsAbstract0_lbl0" xml:lang="en-US">Short Term Investments Abstract0</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ShortTermInvestmentsAbstract0" xlink:to="muzi_ShortTermInvestmentsAbstract0_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="us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_lbl0" xml:lang="en-US">Line of Credit Facility, Current Borrowing Capacity</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:to="us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable_lbl1" xml:lang="en-US">Proceeds From Distributions Netof Changein Distributions Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable" xlink:to="muzi_ProceedsFromDistributionsNetofChangeinDistributionsPayable_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_RecreationalProductsHoldingCompanyLLCPreferredStockClassBMember_lbl0" xml:lang="en-US">Recreational Products Holding Company LLCPreferred Stock Class BMember</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_RecreationalProductsHoldingCompanyLLCPreferredStockClassBMember" xlink:to="muzi_RecreationalProductsHoldingCompanyLLCPreferredStockClassBMember_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_MayEightTwoThousandTwentySixMember_lbl0" xml:lang="en-US">May Eight Two Thousand Twenty Six Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MayEightTwoThousandTwentySixMember" xlink:to="muzi_MayEightTwoThousandTwentySixMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AffiliatedInvestments_lbl1" xml:lang="en-US">Affiliated Investments</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AffiliatedInvestments" xlink:to="muzi_AffiliatedInvestments_lbl1"/>
    <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="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="muzi_USFederalExciseTaxMember_lbl0" xml:lang="en-US">USFederal Excise Tax Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_USFederalExciseTaxMember" xlink:to="muzi_USFederalExciseTaxMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DiversifiedSupportServicesAbstract_lbl0" xml:lang="en-US">Diversified Support Services Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiversifiedSupportServicesAbstract" xlink:to="muzi_DiversifiedSupportServicesAbstract_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="us-gaap_DistributedEarnings_lbl0" xml:lang="en-US">Distributed Earnings</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DistributedEarnings" xlink:to="us-gaap_DistributedEarnings_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_May132025Member_lbl0" xml:lang="en-US">May132025 Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_May132025Member" xlink:to="muzi_May132025Member_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FeeIncome_lbl0" xml:lang="en-US">Fee Income</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FeeIncome" xlink:to="us-gaap_FeeIncome_lbl0"/>
    <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_RevenueRecognitionInterest_lbl0" xml:lang="en-US">Revenue Recognition, Interest [Policy Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_RevenueRecognitionInterest" xlink:to="us-gaap_RevenueRecognitionInterest_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentCompanyofAccretion_lbl1" xml:lang="en-US">Investment Companyof Accretion</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyofAccretion" xlink:to="muzi_InvestmentCompanyofAccretion_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_MuzinichUSPrivateDebtSCSpMember_lbl0" xml:lang="en-US">Muzinich USPrivate Debt SCSp Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MuzinichUSPrivateDebtSCSpMember" xlink:to="muzi_MuzinichUSPrivateDebtSCSpMember_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_PortfolioCompanyMember_lbl0" xml:lang="en-US">Portfolio Company Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_PortfolioCompanyMember" xlink:to="muzi_PortfolioCompanyMember_lbl0"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfCostOfInvestmentsAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfCostOfInvestmentsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfCostOfInvestmentsAbstract_lbl" xml:lang="en-US">Schedule Of Cost Of Investments Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfCostOfInvestmentsAbstract" xlink:to="muzi_ScheduleOfCostOfInvestmentsAbstract_lbl"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfDeclaredTheFollowingDistributionAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfDeclaredTheFollowingDistributionAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfDeclaredTheFollowingDistributionAbstract_lbl" xml:lang="en-US">Schedule Of Declared The Following Distribution Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfDeclaredTheFollowingDistributionAbstract" xlink:to="muzi_ScheduleOfDeclaredTheFollowingDistributionAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TaxBasisOfInvestmentsUnrealizedAppreciationDepreciationNetAbstract_lbl0" xml:lang="en-US">Investment, Tax Basis, Unrealized Gain (Loss) [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_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_GrossUnrealizedAppreciationOnInvestments_lbl1" 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="muzi_GrossUnrealizedAppreciationOnInvestments" xlink:to="muzi_GrossUnrealizedAppreciationOnInvestments_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl1" 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_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_RealizedInvestmentGainsLosses_lbl1" 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_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentIncomeInterest_lbl1" 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_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_OtherAssetsNoncurrent_lbl0" xml:lang="en-US">Other Assets, Noncurrent</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OtherAssetsNoncurrent" xlink:to="us-gaap_OtherAssetsNoncurrent_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_OperatingExpensesAbstract_lbl0" xml:lang="en-US">Operating Expenses [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingExpensesAbstract_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="muzi_LeisureFacilitiesAbstract_lbl0" xml:lang="en-US">Leisure Facilities Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureFacilitiesAbstract" xlink:to="muzi_LeisureFacilitiesAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AssetCoverageRatioWithoutReimbursement_lbl1" xml:lang="en-US">Asset Coverage Ratio Without Reimbursement</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AssetCoverageRatioWithoutReimbursement" xlink:to="muzi_AssetCoverageRatioWithoutReimbursement_lbl1"/>
    <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_InvestmentIncomeNetAbstract_lbl0" xml:lang="en-US">Investment Income, Net [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeNetAbstract" xlink:to="us-gaap_InvestmentIncomeNetAbstract_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"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NetIncomeFromPaymentinkindInterest_lbl2" xml:lang="en-US">Net Income From Paymentinkind Interest</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_MoneyMarketFundsAbstract_lbl0" xml:lang="en-US">Money Market Funds Abstract</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_StockholdersEquityAbstract_lbl0" xml:lang="en-US">Equity, Attributable to Parent [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquityAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_QuestBidcoGoApeLLCSecondLienTermLoanMember_lbl0" xml:lang="en-US">Quest Bidco Go Ape LLCSecond Lien Term Loan Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QuestBidcoGoApeLLCSecondLienTermLoanMember" xlink:to="muzi_QuestBidcoGoApeLLCSecondLienTermLoanMember_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="us-gaap_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatio_lbl0" xml:lang="en-US">Investment Company, Senior Security, Indebtedness, Asset Coverage Ratio</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatio" xlink:to="us-gaap_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatio_lbl0"/>
    <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_AquaLeisureRecreationLLCTwoMember_lbl0" xml:lang="en-US">Aqua Leisure Recreation LLCTwo Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AquaLeisureRecreationLLCTwoMember" xlink:to="muzi_AquaLeisureRecreationLLCTwoMember_lbl0"/>
    <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_DebtDisclosureTextBlock_lbl0" xml:lang="en-US">Debt Disclosure [Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_DebtDisclosureTextBlock" xlink:to="us-gaap_DebtDisclosureTextBlock_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_InvestmentOwnedAtFairValue_lbl4" 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_lbl4"/>
    <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="us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock_lbl0" xml:lang="en-US">Schedule of Line of Credit Facilities [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock" xlink:to="us-gaap_ScheduleOfLineOfCreditFacilitiesTextBlock_lbl0"/>
    <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_MuzinichCoMember_lbl1" xml:lang="en-US">Muzinich Co Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MuzinichCoMember" xlink:to="muzi_MuzinichCoMember_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock_lbl0" xml:lang="en-US">Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock_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="us-gaap_ManagementAndServiceFeesRate_lbl0" xml:lang="en-US">Management and Service Fees, Rate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ManagementAndServiceFeesRate" xlink:to="us-gaap_ManagementAndServiceFeesRate_lbl0"/>
    <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="us-gaap_InvestmentOwnedBalanceShares_lbl0" xml:lang="en-US">Investment Owned, Balance, Shares</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentOwnedBalanceShares" xlink:to="us-gaap_InvestmentOwnedBalanceShares_lbl0"/>
    <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>
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    <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_EquityInvestmentCommonStockMember_lbl1" xml:lang="en-US">Equity Investment Common Stock Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentCommonStockMember" xlink:to="muzi_EquityInvestmentCommonStockMember_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercentWeightedAverageInputs_lbl1" xml:lang="en-US">Fair Value Investments Entities That Calculate Net Asset Value Per Share Percent Weighted Average Inputs</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercentWeightedAverageInputs" xlink:to="muzi_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerSharePercentWeightedAverageInputs_lbl1"/>
    <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_InterestPaidNet_lbl0" xml:lang="en-US">Interest Paid, Excluding Capitalized Interest, Operating Activity</label>
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    <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"/>
    <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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_SubordinatedBorrowingInterestRate_lbl0" xml:lang="en-US">Subordinated Borrowing, Interest Rate</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_SubordinatedBorrowingInterestRate" xlink:to="us-gaap_SubordinatedBorrowingInterestRate_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"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfSignificantUnobservableInputsAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfSignificantUnobservableInputsAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfSignificantUnobservableInputsAbstract_lbl" xml:lang="en-US">Schedule Of Significant Unobservable Inputs Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfSignificantUnobservableInputsAbstract" xlink:to="muzi_ScheduleOfSignificantUnobservableInputsAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestIncomeOperatingPaidInCash_lbl0" xml:lang="en-US">Interest Income, Operating, Paid in Cash</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InterestIncomeOperatingPaidInCash" xlink:to="us-gaap_InterestIncomeOperatingPaidInCash_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>
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    <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>
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    <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="muzi_LeisureProductsMember_lbl0" xml:lang="en-US">Leisure Products Member</label>
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    <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>
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    <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="muzi_DiamondBladeWarehouseMember_lbl0" xml:lang="en-US">Diamond Blade Warehouse Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiamondBladeWarehouseMember" xlink:to="muzi_DiamondBladeWarehouseMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_lbl0" xml:lang="en-US">Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DiamondBladeWarehouseLLCFirstLienTermLoanMember_lbl0" xml:lang="en-US">Diamond Blade Warehouse LLCFirst Lien Term Loan Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiamondBladeWarehouseLLCFirstLienTermLoanMember" xlink:to="muzi_DiamondBladeWarehouseLLCFirstLienTermLoanMember_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>
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    <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>
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    <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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DiamondBladeWarehouseFirstLienTermLoanMember_lbl0" xml:lang="en-US">Diamond Blade Warehouse First Lien Term Loan Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DiamondBladeWarehouseFirstLienTermLoanMember" xlink:to="muzi_DiamondBladeWarehouseFirstLienTermLoanMember_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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_May82026Member_lbl0" xml:lang="en-US">May82026 Member</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_UnlabeledAbstract_lbl0" xml:lang="en-US">Unlabeled Abstract</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_LeisureFacilitiesAbstract2_lbl0" xml:lang="en-US">Leisure Facilities Abstract2</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue_lbl0" 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_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_lbl0" xml:lang="en-US">Line of Credit Facility, Interest Rate During Period</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityInterestRateDuringPeriod" xlink:to="us-gaap_LineOfCreditFacilityInterestRateDuringPeriod_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ContingentPaymentMember_lbl0" xml:lang="en-US">Contingent Payment Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ContingentPaymentMember" xlink:to="muzi_ContingentPaymentMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AutomotiveMember_lbl0" xml:lang="en-US">Automotive Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveMember" xlink:to="muzi_AutomotiveMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentCompanyAcquisitions_lbl1" xml:lang="en-US">Investment Company Acquisitions</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyAcquisitions" xlink:to="muzi_InvestmentCompanyAcquisitions_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_lbl0" xml:lang="en-US">Adjustments to Additional Paid in Capital, Other</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_AdjustmentsToAdditionalPaidInCapitalOther" xlink:to="us-gaap_AdjustmentsToAdditionalPaidInCapitalOther_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_LineOfCreditFacilityIncreaseAccruedInterest_lbl0" xml:lang="en-US">Line of Credit Facility, Increase, Accrued Interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_LineOfCreditFacilityIncreaseAccruedInterest" xlink:to="us-gaap_LineOfCreditFacilityIncreaseAccruedInterest_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_CommercialBuildingProductsMember_lbl0" xml:lang="en-US">Commercial Building Products Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_CommercialBuildingProductsMember" xlink:to="muzi_CommercialBuildingProductsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss_lbl1" xml:lang="en-US">Investment Company Distributable Earnings Loss Accumulated Short Term Capital Gain Loss</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss" xlink:to="muzi_InvestmentCompanyDistributableEarningsLossAccumulatedShortTermCapitalGainLoss_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_lbl1" 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_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_EquityInvestmentsPreferredStock12Abstract0_lbl0" xml:lang="en-US">Equity Investments Preferred Stock12 Abstract0</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_EquityInvestmentsPreferredStock12Abstract0" xlink:to="muzi_EquityInvestmentsPreferredStock12Abstract0_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_IncreaseDecreaseInProfessionalFeePayable_lbl0" xml:lang="en-US">Increase (Decrease) in Professional Fee Payable</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_IncreaseDecreaseInProfessionalFeePayable" xlink:to="us-gaap_IncreaseDecreaseInProfessionalFeePayable_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AutomotiveAbstract_lbl0" xml:lang="en-US">Automotive Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract" xlink:to="muzi_AutomotiveAbstract_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="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"/>
    <loc xlink:type="locator" xlink:label="muzi_ScheduleOfDistributionAbstract" xlink:href="muzi-20260630.xsd#muzi_ScheduleOfDistributionAbstract"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ScheduleOfDistributionAbstract_lbl" xml:lang="en-US">Schedule Of Distribution Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ScheduleOfDistributionAbstract" xlink:to="muzi_ScheduleOfDistributionAbstract_lbl"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ItConsultingAbstract0_lbl0" xml:lang="en-US">It Consulting Abstract0</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ItConsultingAbstract0" xlink:to="muzi_ItConsultingAbstract0_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_MarketApproachMember_lbl1" xml:lang="en-US">Market Approach Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MarketApproachMember" xlink:to="muzi_MarketApproachMember_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyTaxReclassificationIncreaseDecrease_lbl0" xml:lang="en-US">Investment Company, Tax Reclassification, Increase (Decrease)</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyTaxReclassificationIncreaseDecrease" xlink:to="us-gaap_InvestmentCompanyTaxReclassificationIncreaseDecrease_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_QuestBidcoLLCSecondLienTermLoanMember_lbl0" xml:lang="en-US">Quest Bidco LLCSecond Lien Term Loan Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QuestBidcoLLCSecondLienTermLoanMember" xlink:to="muzi_QuestBidcoLLCSecondLienTermLoanMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ItConsultingAbstract2_lbl0" xml:lang="en-US">It Consulting Abstract2</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ItConsultingAbstract2" xlink:to="muzi_ItConsultingAbstract2_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ItConsultingAbstract1_lbl0" xml:lang="en-US">It Consulting Abstract1</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ItConsultingAbstract1" xlink:to="muzi_ItConsultingAbstract1_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock_lbl0" xml:lang="en-US">Schedule of Investments in and Advances to Affiliates, Schedule of Investments [Table Text Block]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock" xlink:to="us-gaap_ScheduleOfInvestmentsInAndAdvancesToAffiliatesScheduleOfInvestmentsTableTextBlock_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ShortTermInvestmentsMember_lbl0" xml:lang="en-US">Short-Term Investments [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermInvestmentsMember" xlink:to="us-gaap_ShortTermInvestmentsMember_lbl0"/>
    <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_DividendPayableAmountPerShare_lbl1" xml:lang="en-US">Dividend Payable Amount Per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DividendPayableAmountPerShare" xlink:to="muzi_DividendPayableAmountPerShare_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_DistributionPayable_lbl2" 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_lbl2"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AquaLeisureRecreationLLCThreeMember_lbl0" xml:lang="en-US">Aqua Leisure Recreation LLCThree Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AquaLeisureRecreationLLCThreeMember" xlink:to="muzi_AquaLeisureRecreationLLCThreeMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_PaidInKindInterest_lbl0" xml:lang="en-US">Paid-in-Kind Interest</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_PaidInKindInterest" xlink:to="us-gaap_PaidInKindInterest_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyTotalReturnPaymentByAffiliateLossOnInvestmentInViolation_lbl0" xml:lang="en-US">Investment Company, Total Return, Payment by Affiliate, Loss on Investment in Violation</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentCompanyTotalReturnPaymentByAffiliateLossOnInvestmentInViolation" xlink:to="us-gaap_InvestmentCompanyTotalReturnPaymentByAffiliateLossOnInvestmentInViolation_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="muzi_OrganizationAndOfferingCostsPolicyTextBlock_lbl1" xml:lang="en-US">Organization And Offering Costs Policy Text Block</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_OrganizationAndOfferingCostsPolicyTextBlock" xlink:to="muzi_OrganizationAndOfferingCostsPolicyTextBlock_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_QUESTJVCOLIMITEDClassAMember_lbl0" xml:lang="en-US">QUESTJVCOLIMITEDClass AMember</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_QUESTJVCOLIMITEDClassAMember" xlink:to="muzi_QUESTJVCOLIMITEDClassAMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AffiliatedInvestmentsMember_lbl0" xml:lang="en-US">Affiliated Investments Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AffiliatedInvestmentsMember" xlink:to="muzi_AffiliatedInvestmentsMember_lbl0"/>
    <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="us-gaap_ShortTermInvestmentsAbstract_lbl0" xml:lang="en-US">Short-Term Investments [Abstract]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_ShortTermInvestmentsAbstract" xlink:to="us-gaap_ShortTermInvestmentsAbstract_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AutomotiveAbstract0_lbl0" xml:lang="en-US">Automotive Abstract0</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract0" xlink:to="muzi_AutomotiveAbstract0_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="muzi_AutomotiveAbstract4_lbl0" xml:lang="en-US">Automotive Abstract4</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract4" xlink:to="muzi_AutomotiveAbstract4_lbl0"/>
    <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="muzi_AutomotiveAbstract3_lbl0" xml:lang="en-US">Automotive Abstract3</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract3" xlink:to="muzi_AutomotiveAbstract3_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AutomotiveAbstract2_lbl0" xml:lang="en-US">Automotive Abstract2</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract2" xlink:to="muzi_AutomotiveAbstract2_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_AutomotiveAbstract1_lbl0" xml:lang="en-US">Automotive Abstract1</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_AutomotiveAbstract1" xlink:to="muzi_AutomotiveAbstract1_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare_lbl1" xml:lang="en-US">Investment Company Distribution To Shareholders Decrease In Net Assets Resulting From Distributions Per Share</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare" xlink:to="muzi_InvestmentCompanyDistributionToShareholdersDecreaseInNetAssetsResultingFromDistributionsPerShare_lbl1"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_LeisureProductsAbstract_lbl0" xml:lang="en-US">Leisure Products Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_LeisureProductsAbstract" xlink:to="muzi_LeisureProductsAbstract_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"/>
    <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_InvestmentIncomeInvestmentExpense_lbl0" xml:lang="en-US">Investment Income, Investment Expense</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_InvestmentIncomeInvestmentExpense" xlink:to="us-gaap_InvestmentIncomeInvestmentExpense_lbl0"/>
    <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"/>
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    <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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_LeisureProductsAbstract1_lbl0" xml:lang="en-US">Leisure Products Abstract1</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentAffiliatedIssuerMember_lbl0" xml:lang="en-US">Investment, Affiliated Issuer [Member]</label>
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    <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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InterestExpenseOperating_lbl0" xml:lang="en-US">Interest Expense, Operating</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PercentageOfInvestmentCompanyTaxableIncome_lbl1" xml:lang="en-US">Percentage Of Investment Company Taxable Income</label>
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    <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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_RatioSupplementalDataAbstract_lbl0" xml:lang="en-US">Ratio Supplemental Data Abstract</label>
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    <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>
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    <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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_TradingSecuritiesDebtAmortizedCost_lbl0" xml:lang="en-US">Debt Securities, Trading, Amortized Cost</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="us-gaap_TradingSecuritiesDebtAmortizedCost" xlink:to="us-gaap_TradingSecuritiesDebtAmortizedCost_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_DistributionsToCommonStockholdersAbstract_lbl0" xml:lang="en-US">Distributions To Common Stockholders Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_DistributionsToCommonStockholdersAbstract" xlink:to="muzi_DistributionsToCommonStockholdersAbstract_lbl0"/>
    <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_ComputerAndElectronicsRetailAbstract_lbl0" xml:lang="en-US">Computer And Electronics Retail Abstract</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_ComputerAndElectronicsRetailAbstract" xlink:to="muzi_ComputerAndElectronicsRetailAbstract_lbl0"/>
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    <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_ProceedsFromLinesOfCredit_lbl0" xml:lang="en-US">Proceeds from Lines of Credit</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NonControlNonAffiliateInvestmentsMember_lbl0" xml:lang="en-US">Non Control Non Affiliate Investments Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_NonControlNonAffiliateInvestmentsMember" xlink:to="muzi_NonControlNonAffiliateInvestmentsMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_NoncontrollednonaffiliatedInvestments_lbl1" xml:lang="en-US">Noncontrollednonaffiliated Investments</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_CapitalGainLossesRate_lbl1" xml:lang="en-US">Capital Gain Losses Rate</label>
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    <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>
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    <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_MoneyMarketFundMember_lbl0" xml:lang="en-US">Money Market Fund Member</label>
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    <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_lbl4" xml:lang="en-US">Investments, Fair Value Disclosure</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_MayThirteenTwoThousandTwentyFiveMember_lbl0" xml:lang="en-US">May Thirteen Two Thousand Twenty Five Member</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="muzi_MayThirteenTwoThousandTwentyFiveMember" xlink:to="muzi_MayThirteenTwoThousandTwentyFiveMember_lbl0"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_ManagementFeeExpense_lbl1" xml:lang="en-US">Management Fee Expense</label>
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    <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>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_MidwestTradingGroupAcquisitionLLCClassA3Member_lbl0" xml:lang="en-US">Midwest Trading Group Acquisition LLCClass A3 Member</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_PercentageOfBorrowing_lbl1" xml:lang="en-US">Percentage Of Borrowing</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_InvestmentCompanyDistributionToShareholdersPerShare_lbl1" xml:lang="en-US">Investment Company, Distribution to Shareholders, Per Share</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_QUESTJVCOLIMITEDLoanNotesMember_lbl0" xml:lang="en-US">QUESTJVCOLIMITEDLoan Notes Member</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="muzi_ApparelAccessoriesLuxuryGoodsAbstract_lbl0" xml:lang="en-US">Apparel Accessories Luxury Goods Abstract</label>
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