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        <Desc>Historic Preservation and Conservation and Facility Rental: The BSO's two main properties, Symphony Hall and Tanglewood, carry historical significance and represent popular sites supporting the Massachusetts tourist industry. Symphony Hall's acoustic qualities have earned it a place among the top three concert auditoriums in the world, a fact underscored by the hall's 1999 designation as a National Historic Landmark. Symphony Hall resonates with more than a century of performances by key artists spanning the history of classical music. In addition to BSO performances, the hall functions as a key performance venue for a number of local, national, and international ensembles and presenters, including the Handel &amp; Haydn Society, the Celebrity Series of Boston, and the Boston Youth Symphony Orchestras. The hall has a 2625 seat capacity. Located in the Berkshire hills of Lenox, Massachusetts and established in 1936 by then-Music Director Serge Koussevitzky, Tanglewood is the summer performance home of the BSO. Tanglewood annually attracts more than 300,000 visitors and presents ten weeks of diverse programming, including concerts from the BSO, the Tanglewood Music Center, and the Pops. Tanglewood spans more than 500 acres and remains open to the public year-round, much like a state park. 23 buildings reside on the grounds, including two performance venues: the Koussevitzky Music Shed and Seiji Ozawa Concert Hall. Built in 1938, the Koussevitzky Music Shed is a seasonal hall open on three sides with 5,121 seats and additional seating for more than 10,000 on the adjacent lawn. All BSO and visiting orchestra concerts are performed in the shed. Opened in 1994, Seiji Ozawa Hall is a brick and wood structure that provides a venue for chamber music performances and serves as the headquarters of the Tanglewood Music Center. It seats up to 750 audience members on the orchestra level and an additional 450 in the two balconies, as well as hundreds more on the adjacent lawn. During the FY18 season, the BSO invested approximately $1.6 million in maintenance projects at Symphony Hall and its adjacent buildings. At Tanglewood, the BSO began construction on the Linde Center for Music and Learning, adding a new building to the grounds.</Desc>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Thomas E Faust Jr</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Levi A Garraway</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Michael Gordon</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Nathan Hayward III</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Brent L Henry</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <PersonNm>Susan Hockfield</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Barbara W Hostetter</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Stephen Kay</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Edmund Kelly</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Joyce G Linde</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>John M Loder</PersonNm>
        <TitleTxt>Vice-Chair</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Nancy K Lubin</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Joshua A Lutzker</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Carmine A Martignetti</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Robert J Mayer MD</PersonNm>
        <TitleTxt>Co-President</TitleTxt>
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        <PersonNm>Susan W Paine</PersonNm>
        <TitleTxt>Chair</TitleTxt>
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        <PersonNm>Steven R Perles</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>John S Reed</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Carol Reich</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Arthur I Segel</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Wendy Shattuck</PersonNm>
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        <PersonNm>Theresa M Stone</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
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        <PersonNm>Caroline Taylor</PersonNm>
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        <PersonNm>Roberta S Weiner</PersonNm>
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        <PersonNm>Robert C Winters</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>D Brooks Zug</PersonNm>
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        <PersonNm>Mark Volpe</PersonNm>
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        <PersonNm>Thomas D May</PersonNm>
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        <PersonNm>Bart Reidy</PersonNm>
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        <PersonNm>Kim Noltemy</PersonNm>
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        <PersonNm>Malcolm Lowe</PersonNm>
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        <PersonNm>John A Ferrillo Jr</PersonNm>
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        <PersonNm>Thomas C Rolfs Jr</PersonNm>
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        <PersonNm>Steven Ansell</PersonNm>
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        <PersonNm>Timothy Genis</PersonNm>
        <TitleTxt>Timpanist</TitleTxt>
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          <PersonNm>Andris Nelsons</PersonNm>
        </ContractorName>
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          <ForeignAddress>
            <AddressLine1Txt>Konzertdirektion Schmid</AddressLine1Txt>
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            <CityNm>London</CityNm>
            <ProvinceOrStateNm>UK</ProvinceOrStateNm>
            <CountryCd>UK</CountryCd>
            <ForeignPostalCd>WC2N 4ER</ForeignPostalCd>
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      <ContractorCompensationGrp>
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          <BusinessName>
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            <AddressLine2Txt>C/O Creative Artists Agency</AddressLine2Txt>
            <CityNm>Los Angeles</CityNm>
            <StateAbbreviationCd>CA</StateAbbreviationCd>
            <ZIPCd>90067</ZIPCd>
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      <ContractorCompensationGrp>
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            <CityNm>Brookline</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02446</ZIPCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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          <USAddress>
            <AddressLine1Txt>PO Box 828854</AddressLine1Txt>
            <CityNm>Philadelphia</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
            <ZIPCd>19182</ZIPCd>
          </USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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          <USAddress>
            <AddressLine1Txt>470 Park Ave South</AddressLine1Txt>
            <CityNm>New York</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>10016</ZIPCd>
          </USAddress>
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      <MembershipDuesAmt>0</MembershipDuesAmt>
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        <Desc>Concerts &amp; Tours</Desc>
        <BusinessCd>900099</BusinessCd>
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        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Program Advertising</Desc>
        <BusinessCd>511190</BusinessCd>
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        <UnrelatedBusinessRevenueAmt>743821</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Education</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>571511</TotalRevenueColumnAmt>
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        <ExclusionAmt>0</ExclusionAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
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        <PersonNm>Thomas C Rolfs Jr</PersonNm>
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        <PersonNm>Steven Ansell</PersonNm>
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        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>In connection with the business needs of the Boston Symphony Orchestra (BSO), charter travel is used when transporting large number of personnel in connection with the Orchestra's touring. As a general rule. the BSO does not provide first class travel for employees. 2) In rare instances, the Managing Director's spouse may travel with him for donor cultivation and fundraising purposes. Events attended are related to business purposes of the BSO. Such travel is entered into and substantiated in accordance with the spousal travel policy adopted by the BSO. 3) Housing for Mark Volpe, Managing Director, is provided during the summer for the convenience of the BSO in connection with the Orchestra's activities away from Boston at Tanglewood, and is not considered taxable.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>The compensation reported for Mark Volpe, Managing Director, for calendar year 2017 includes Base Compensation of $653,492. Other Reportable Compensation includes, 1) taxable fringe in the amount of $12,164 mainly for life and disability insurance and for personal use of a vehicle provided by the BSO; 2) contributions of $18,000 made by Mr. Volpe into a 457(b) plan; and 3) a payment of $311,663 which represents the current year obligation related to a retirement compensation plan established for Mr. Volpe in fiscal year 2007 in recognition of his 10 years of outstanding service to the BSO. As amended in 2013, the plan is to provide Mr. Volpe an annual retirement benefit at age 60 equal to approximately 50% of the average compensation earned during his last 5 years of employment. An irrevocable portion of this benefit is accrued and paid each year that he is employed.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part I, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>Volunteers comprise the 699 members of the Boston Symphony Association of volunteers (BSAV), who provide a variety of services both at Symphony Hall and Tanglewood; 293 volunteer members of the Tanglewod Festival Chorus (TFC), who donate their time and talent performing year-round with the Boston Symphony Orchestra and the Boston Pops Orchestra; 36 voting trustees and 228 non-voting members of the governing body.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>Trustee Stephen Kay serves on the Board of the Dana-Farber Cancer Institute. The Dana-Farber Cancer institute employs another trustee, Dr. Robert J. Mayer, MD.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990 is prepared by BSO management and reviewed by a paid preparer. The complete 990 is then reviewed by the Audit, Risk, and Compliance Committee of the Board of Trustees. The Audit, Risk, and Compliance Committee reviews each section and schedule of the 990, focusing on key changes and substantive disclosures. Subsequent to this review, a copy of the final draft 990, which is the version to be filed with the IRS, is placed in a password-protected website of all members of the Board of Trustees to review in advance of their next board meeting. All members of the Board of Trustees receive an email notifying them that the Form 990 is available for review on the site. The final 990 is signed by the Chief Financial Officer and the paid preparer.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>The Boston Symphony Orchestra has a Conflict of Interest Policy that encompasses all employees and board members. The policy requires that Trustees, Officers, Advisors, Ex-Officio board members, members of a committee with board-delegated powers, senior staff members or any other person with substantial influence over the BSO disclose the existence of any potential or actual conflicts of interest to the Board or to the Executive Committee. The Board or Executive Committee then discusses and votes to determine whether an actual conflict of interest exists. If a conflict exists, the Board or Executive Committee evaluates the particular transaction or arrangement to determine the most reasonable course of action. The individual who disclosed the conflict must leave the Board or Executive Committee meeting during the discussion of, and the vote on, the transaction or arrangement that results in the conflict of interest. Additionally, the policy also requires any staff member that has information about a possible conflict, to report the matter, promptly, to his or her supervisor, the Director of Human Resources, or the Chief Financial Officer. The Director of Human Resources and the Chief Financial Officer will review the circumstances of the possible conflict with other, appropriate, management to make the determination about the most reasonable coarse of action. A breach of the conflict of interest policy is grounds for disciplinary action, up to and including termination. Additionally, on an annual basis, all Trustees, Officers, Advisors, Ex-Officio Board members, members of a committee with board delegated powers, senior staff members or any person with substantial influence over the BSO is provided with a copy of the policy and must sign a statement affirming that they have received, read, and understand the policy; they must also affirm that they agree to comply with the policy. As part of this Annual Notice of Policy, each individual is required to disclose any potential or actual conflicts of interest in writing. All responses indicating a potential or actual conflict are subject to review by the Board or Executive Committee as described above.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>The BSO has a designated Compensation Committee, comprised of trustees of the BSO, which sets the process for determining and approving compensation for officers and key employees. The Compensation Committee's process includes: (a) development and consideration of comparability data to provide the bases for the Committee's decisions and (b) consideration of (i) applicable accounting and disclosure rules, (ii) emerging trends in corporate governance, and (iii) standards and guidelines promulgated by the Division of Public Charities of the Massachusetts Office of the Attorney General (collectively, the "Compensation Process"). Deliberations of the Compensation Committee in connection with the Compensation Process are contemporaneously documented. When evaluating officers and key employees, the Compensation Committee carefully considers the following factors: (i) duties and responsibilities, (ii) background and experience, (iii) dedication, commitment and work schedule, (iv) leadership, management, and professional skills, (v) overall performance and standing, (vi) BSO's salary scale of employees generally, and (vii) the BSO's annual budget. The Compensation Committee's most recent review of officer and key employee compensation occurred in 2017.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Boston Symphony Orchestra's audited financial statements, conflict of interest policy and other governing documents are available upon request.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VII, Section A, Line 1b</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation reported is based on year 2017 amounts.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VII, Section B, Line 1(C)</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation reported is based on calendar year 2017 results.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Comprises of $14,056,886 of artistic and other concert related fees and $2,491,366 of medical, parking, and other services.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Other changes in net assets or fund balances of $15,649,634 comprise of the change in value of the split interest agreements of $1,067,626 and retirement plan-related charges and other than net periodic benefit costs of $14,582,008.</ExplanationTxt>
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