﻿<?xml version="1.0" encoding="utf-8"?>
<Return xmlns="http://www.irs.gov/efile" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.irs.gov/efile" returnVersion="2024v5.2">
  <ReturnHeader binaryAttachmentCnt="0">
    <ReturnTs>2025-08-31T12:16:36-00:00</ReturnTs>
    <TaxPeriodEndDt>2025-06-30</TaxPeriodEndDt>
    <ReturnTypeCd>990EZ</ReturnTypeCd>
    <TaxPeriodBeginDt>2024-07-01</TaxPeriodBeginDt>
    <Filer>
      <EIN>942626017</EIN>
      <BusinessName>
        <BusinessNameLine1Txt>Chamber Music Marin</BusinessNameLine1Txt>
      </BusinessName>
      <BusinessNameControlTxt>CHAM</BusinessNameControlTxt>
      <PhoneNum>4157063193</PhoneNum>
      <USAddress>
        <AddressLine1Txt>PO Box 1907</AddressLine1Txt>
        <CityNm>Mill Valley</CityNm>
        <StateAbbreviationCd>CA</StateAbbreviationCd>
        <ZIPCd>94942</ZIPCd>
      </USAddress>
    </Filer>
    <BusinessOfficerGrp>
      <PersonNm>Kathleen Doyle</PersonNm>
      <PersonTitleTxt>Treasurer</PersonTitleTxt>
      <PhoneNum>4157063193</PhoneNum>
      <SignatureDt>2025-09-01</SignatureDt>
      <DiscussWithPaidPreparerInd>true</DiscussWithPaidPreparerInd>
    </BusinessOfficerGrp>
    <IRSResponsiblePrtyInfoCurrInd>true</IRSResponsiblePrtyInfoCurrInd>
    <PreparerPersonGrp>
      <PreparerPersonNm>William L Papendick</PreparerPersonNm>
      <PTIN>P00228054</PTIN>
      <PhoneNum>4154794262</PhoneNum>
      <PreparationDt>2025-08-31</PreparationDt>
      <SelfEmployedInd>X</SelfEmployedInd>
    </PreparerPersonGrp>
    <TaxYr>2024</TaxYr>
    <BuildTS>2025-03-06 01:10:19Z</BuildTS>
  </ReturnHeader>
  <ReturnData documentCnt="4">
    <IRS990EZ documentId="990EZ" softwareId="24019898" softwareVersionNum="24.0.1.0">
      <NameChangeInd>X</NameChangeInd>
      <MethodOfAccountingCashInd>X</MethodOfAccountingCashInd>
      <WebsiteAddressTxt>www.chambermusicmarin.org</WebsiteAddressTxt>
      <Organization501c3Ind referenceDocumentId="990A">X</Organization501c3Ind>
      <TypeOfOrganizationCorpInd>X</TypeOfOrganizationCorpInd>
      <GrossReceiptsAmt>108623</GrossReceiptsAmt>
      <InfoInScheduleOPartIInd>X</InfoInScheduleOPartIInd>
      <ContributionsGiftsGrantsEtcAmt>58609</ContributionsGiftsGrantsEtcAmt>
      <ProgramServiceRevenueAmt>43320</ProgramServiceRevenueAmt>
      <InvestmentIncomeAmt>6694</InvestmentIncomeAmt>
      <TotalRevenueAmt>108623</TotalRevenueAmt>
      <FeesAndOtherPymtToIndCntrctAmt>39410</FeesAndOtherPymtToIndCntrctAmt>
      <OccupancyRentUtltsAndMaintAmt>5117</OccupancyRentUtltsAndMaintAmt>
      <PrintingPublicationsPostageAmt>12637</PrintingPublicationsPostageAmt>
      <OtherExpensesTotalAmt>12545</OtherExpensesTotalAmt>
      <TotalExpensesAmt>69709</TotalExpensesAmt>
      <ExcessOrDeficitForYearAmt>38914</ExcessOrDeficitForYearAmt>
      <NetAssetsOrFundBalancesBOYAmt>162073</NetAssetsOrFundBalancesBOYAmt>
      <NetAssetsOrFundBalancesEOYAmt>200987</NetAssetsOrFundBalancesEOYAmt>
      <InfoInScheduleOPartIIInd>X</InfoInScheduleOPartIIInd>
      <CashSavingsAndInvestmentsGrp>
        <BOYAmt>161768</BOYAmt>
        <EOYAmt>200325</EOYAmt>
      </CashSavingsAndInvestmentsGrp>
      <OtherAssetsTotalDetail>
        <BOYAmt>305</BOYAmt>
        <EOYAmt>666</EOYAmt>
      </OtherAssetsTotalDetail>
      <Form990TotalAssetsGrp>
        <BOYAmt>162073</BOYAmt>
        <EOYAmt>200991</EOYAmt>
      </Form990TotalAssetsGrp>
      <SumOfTotalLiabilitiesGrp>
        <EOYAmt>4</EOYAmt>
      </SumOfTotalLiabilitiesGrp>
      <NetAssetsOrFundBalancesGrp>
        <BOYAmt>162073</BOYAmt>
        <EOYAmt>200987</EOYAmt>
      </NetAssetsOrFundBalancesGrp>
      <PrimaryExemptPurposeTxt>Provide classical musical concerts public school outreach</PrimaryExemptPurposeTxt>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>Provided five chamber music concerts, all well advertised and open to the public with an average attendance of 186. As part of Outreach, a Young Artist Concert, was co-sponsored with the Marin Music Chest.</DescriptionProgramSrvcAccomTxt>
        <ProgramServiceExpensesAmt>52980</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <ProgramSrvcAccomplishmentGrp>
        <DescriptionProgramSrvcAccomTxt>Provided Outreach to 2 events Sausalito/Marin City School with Craig Reiss thru SF Ballet 2 events Saualito/Marin City school with Brass over Bridges.</DescriptionProgramSrvcAccomTxt>
        <ProgramServiceExpensesAmt>4737</ProgramServiceExpensesAmt>
      </ProgramSrvcAccomplishmentGrp>
      <TotalProgramServiceExpensesAmt>57717</TotalProgramServiceExpensesAmt>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Anna Vagin</PersonNm>
        <TitleTxt>President</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>010.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Julia Lewis</PersonNm>
        <TitleTxt>Secretary</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>002.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Kathleen Doyle</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>004.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <OfficerDirectorTrusteeEmplGrp>
        <PersonNm>Bill Horne</PersonNm>
        <TitleTxt>Artist Selection Chair</TitleTxt>
        <AverageHrsPerWkDevotedToPosRt>003.00</AverageHrsPerWkDevotedToPosRt>
        <CompensationAmt>0</CompensationAmt>
      </OfficerDirectorTrusteeEmplGrp>
      <ActivitiesNotPreviouslyRptInd>false</ActivitiesNotPreviouslyRptInd>
      <ChgMadeToOrgnzngDocNotRptInd>false</ChgMadeToOrgnzngDocNotRptInd>
      <OrganizationHadUBIInd>false</OrganizationHadUBIInd>
      <SubjectToProxyTaxInd>false</SubjectToProxyTaxInd>
      <OrganizationDissolvedEtcInd>false</OrganizationDissolvedEtcInd>
      <Form1120PolFiledInd>false</Form1120PolFiledInd>
      <MadeLoansToFromOfficersInd>false</MadeLoansToFromOfficersInd>
      <TaxImposedUnderIRC4911Amt>0</TaxImposedUnderIRC4911Amt>
      <TaxImposedUnderIRC4912Amt>0</TaxImposedUnderIRC4912Amt>
      <TaxImposedUnderIRC4955Amt>0</TaxImposedUnderIRC4955Amt>
      <EngagedInExcessBenefitTransInd>false</EngagedInExcessBenefitTransInd>
      <ProhibitedTaxShelterTransInd>false</ProhibitedTaxShelterTransInd>
      <StatesWhereCopyOfReturnIsFldCd>CA</StatesWhereCopyOfReturnIsFldCd>
      <BooksInCareOfDetail>
        <PersonNm>Kathleen Doyle</PersonNm>
        <USAddress>
          <AddressLine1Txt>PO Box 1907</AddressLine1Txt>
          <CityNm>Mill Valley</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>949421907</ZIPCd>
        </USAddress>
        <PhoneNum>4154196261</PhoneNum>
      </BooksInCareOfDetail>
      <ForeignFinancialAccountInd>false</ForeignFinancialAccountInd>
      <ForeignOfficeInd>false</ForeignOfficeInd>
      <DonorAdvisedFndsInd>false</DonorAdvisedFndsInd>
      <OperateHospitalInd>false</OperateHospitalInd>
      <TanningServicesProvidedInd>false</TanningServicesProvidedInd>
      <Form720FiledInd>false</Form720FiledInd>
      <RelatedOrganizationCtrlEntInd>false</RelatedOrganizationCtrlEntInd>
      <TransactionWithControlEntInd>false</TransactionWithControlEntInd>
      <PoliticalCampaignActyInd>false</PoliticalCampaignActyInd>
      <LobbyingActivitiesInd>false</LobbyingActivitiesInd>
      <SchoolOperatingInd>false</SchoolOperatingInd>
      <TrnsfrExmptNonChrtblRltdOrgInd>false</TrnsfrExmptNonChrtblRltdOrgInd>
      <PartVIOfCompOfHghstPdEmplTxt>NONE</PartVIOfCompOfHghstPdEmplTxt>
      <PartVIHghstPdCntrctProfSrvcTxt>NONE</PartVIHghstPdCntrctProfSrvcTxt>
      <FiledScheduleAInd>true</FiledScheduleAInd>
    </IRS990EZ>
    <IRS990ScheduleA documentId="990A" softwareId="24019898" softwareVersionNum="24.0.1.0">
      <PubliclySupportedOrg509a2Ind>X</PubliclySupportedOrg509a2Ind>
      <GiftsGrantsContrisRcvd509Grp>
        <CurrentTaxYearMinus4YearsAmt>19465</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>37673</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>56439</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>43159</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>58609</CurrentTaxYearAmt>
        <TotalAmt>215345</TotalAmt>
      </GiftsGrantsContrisRcvd509Grp>
      <GrossReceiptsAdmissionsGrp>
        <CurrentTaxYearMinus4YearsAmt>433</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>25534</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>44831</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>39678</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>43320</CurrentTaxYearAmt>
        <TotalAmt>153796</TotalAmt>
      </GrossReceiptsAdmissionsGrp>
      <Total509Grp>
        <CurrentTaxYearMinus4YearsAmt>19898</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>63207</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>101270</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>82837</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>101929</CurrentTaxYearAmt>
        <TotalAmt>369141</TotalAmt>
      </Total509Grp>
      <PublicSupportTotal509Amt>369141</PublicSupportTotal509Amt>
      <GrossInvestmentIncome509Grp>
        <CurrentTaxYearMinus4YearsAmt>156</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>26</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>31</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>2801</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>6694</CurrentTaxYearAmt>
        <TotalAmt>9708</TotalAmt>
      </GrossInvestmentIncome509Grp>
      <Post1975UBTIGrp>
        <TotalAmt>0</TotalAmt>
      </Post1975UBTIGrp>
      <InvestmentIncomeAndUBTIGrp>
        <CurrentTaxYearMinus4YearsAmt>156</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>26</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>31</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>2801</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>6694</CurrentTaxYearAmt>
        <TotalAmt>9708</TotalAmt>
      </InvestmentIncomeAndUBTIGrp>
      <NetIncomeFromOtherUBIGrp>
        <TotalAmt>0</TotalAmt>
      </NetIncomeFromOtherUBIGrp>
      <OtherIncome509Grp>
        <TotalAmt>0</TotalAmt>
      </OtherIncome509Grp>
      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus4YearsAmt>20054</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>63233</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>101301</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>85638</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>108623</CurrentTaxYearAmt>
        <TotalAmt>378849</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.97440</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.98960</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.02560</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.01040</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="990B" softwareId="24019898" softwareVersionNum="24.0.1.0">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleO documentId="990O" softwareId="24019898" softwareVersionNum="24.0.1.0">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Meals and entertainment 900</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Telephone 565</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Liability Insurance 725</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Directors and Officers Insurance 1,001</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Memberships and dues 238</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Business Registration fees 50</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Accounting Tax preparatin 275</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>marketing and Advertising 8,654</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part I, Line 16, Other Expenses</FormAndLineReferenceDesc>
        <ExplanationTxt>Marketing and Advertising Outreach 137</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part II, Line 24, Other Assets</FormAndLineReferenceDesc>
        <ExplanationTxt>Accounts Receivable Beginning of year 305, End of year 666</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990-EZ, Part II, Line 26, Liabilities</FormAndLineReferenceDesc>
        <ExplanationTxt>Accounts payable Beginning of year 0, End of year 4</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>