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        <Desc>Education:Education and community programs are integral to the BSO's mission and are delivered via two avenues: 1) The Tanglewood Music Center (TMC), BSO's summer academy for rising professional musicians; and 2) Education and Community Engagement Department programs for individuals of all backgrounds. The TMC serves as a bridge from the conservatory to the professional world, where promising young musicians gain access to some of the world's finest professionals and are primed for successful performing careers. The TMC also functions as a think tank for faculty, who are encouraged to explore uncharted directions in composition, conducting, and collaboration to advance and influence the field. The principal areas of study and performance at the TMC are orchestral and chamber music, with an emphasis on contemporary music, vocal repertoire from art song to opera, composition, and conducting. In 2017, the TMC provided 143 of the world's most promising young musicians (representing 30 states and 18 countries) the opportunity to engage in intensive, performance-oriented work with BSO musicians, resident and guest faculty members, and visiting guest artists. TMC students presented 26 concerts of orchestral, vocal, and chamber works throughout the summer. Education and community engagement programs reached more than 32,000 students, teachers, and families, many of whom come from low-income communities in the Greater Boston area. Highlights include: 1) Youth and Family Concerts: more than 24,000 tickets distributed for 14 concerts (including Open Rehearsals, Tanglewood Family Concert, and BYSO concerts). 1,200 Boston Public School students received free tickets to Youth Concerts, and all children under the age of 18 attended Family Concerts for free. 2) Community Chamber Concerts: approximately 2,700 in attendance. BSO musicians perfomed free concerts led post-concert discussions at Northeastern University and in 10 communities limited in access by distance or economics. 3) Symphony for Our City: Symphony for Our City partnered with 12 nonprofit organizations in Greater Boston to provide 768 free tickets to three BSO, Pops, and Tanglewood performances. Concert attendees also met with Andris Nelsons post-performance. 4) Days in the Arts (DARTS): 389 students reached. Thanks to generous tuition subsidies, students from urban, suburban, and rural communities gained a confidence-building introduction to the arts and inclusion in a diverse, supportive community.</Desc>
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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. In 2017 at Symphony Hall, in addition to minor repairs, renovations, and improvements throughout the hall the BSO undertook the complete replacement of the hall's chiller system. At Tanglewood, activity centered on preparations for construction of a new facility-the largest construction project at Tanglewood since construction of Seiji Ozawa Hall-the Tanglewood Music Center/Tanglewood Learning Institute complex.</Desc>
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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>Brent L Henry</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <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>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Joyce G Linde</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>John M Loder</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>2</AverageHoursPerWeekRt>
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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>Vice-Chair</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Robert J Mayer MD</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Susan W Paine</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Steven R Perles</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>John Reed</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Carol Reich</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Arthur I Segel</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Wendy Shattuck</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Theresa M Stone</PersonNm>
        <TitleTxt>Treasurer</TitleTxt>
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        <PersonNm>Caroline Taylor</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Stephen R Weber</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Roberta S Weiner</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Robert C Winters</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>D Brooks Zug</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Mark Volpe</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Thomas D May</PersonNm>
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      <Form990PartVIISectionAGrp>
        <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>
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          <PersonNm>Andris Nelsons</PersonNm>
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          <ForeignAddress>
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      <ContractorCompensationGrp>
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          <BusinessName>
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        <ContractorAddress>
          <USAddress>
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            <AddressLine2Txt>C/O Creative Artists Agency</AddressLine2Txt>
            <CityNm>Los Angeles</CityNm>
            <StateAbbreviationCd>CA</StateAbbreviationCd>
            <ZIPCd>90067</ZIPCd>
          </USAddress>
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        <ServicesDesc>Perform concerts</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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          <USAddress>
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            <CityNm>Brookline</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02446</ZIPCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Opus 3 Artists LLC</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>470 Park Ave South</AddressLine1Txt>
            <CityNm>New York</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
            <ZIPCd>10016</ZIPCd>
          </USAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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          <USAddress>
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            <CityNm>Philadelphia</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
            <ZIPCd>19182</ZIPCd>
          </USAddress>
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        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Program advertising</Desc>
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        <UnrelatedBusinessRevenueAmt>750696</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Education</Desc>
        <BusinessCd>900099</BusinessCd>
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        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>Electronic Media</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>199576</TotalRevenueColumnAmt>
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        <ExclusionAmt>0</ExclusionAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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        <PersonNm>Thomas C Rolfs Jr</PersonNm>
        <TitleTxt>Principal Trumpet</TitleTxt>
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        <TotalCompensationFilingOrgAmt>350318</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <PersonNm>Steven Ansell</PersonNm>
        <TitleTxt>Principal Viola</TitleTxt>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
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        <TotalCompensationFilingOrgAmt>333133</TotalCompensationFilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Timothy Genis</PersonNm>
        <TitleTxt>Timpanist</TitleTxt>
        <BaseCompensationFilingOrgAmt>222969</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>1) 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 2016 includes Base Compensation of $682,442. Other Reportable Compensation includes, 1) taxable fringe in the amount of $12,224 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 $279,672 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. The compensation reported for John Ferillo, Principal Oboe, for calendar year 2016 includes Base Compensation of $286,642. Other Reportable Compensation includes 1) Other Services in the amount of $2,840 and 2) a payment of $184,944 which represents the cumulative obligation related to a Supplemental Retirement Plan that was adopted for Mr. Ferrillo July 2, 2001. Mr. Ferrillo will become 100% vested in the balance credited to the account upon the first to occur: 1) completion of fifteen consecutive years of employment as an oboist with the BSO; 2) the non-renewal of Player's contract under Paragraph 31 of the current trade agreement; or 3) after conclusion of Mr. Ferrillo's trial acceptance period, Mr. Ferrillo's becoming totally disabled and unable to fulfill his position, as determined by a physician. Mr. Ferrillo completed fifteen consecutive years of employment as an oboist with the BSO during 2016.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>The compensation reported for Malcolm Lowe, Concertmaster, for calendar year 2016 includes Base Compensation of $452,722. Bonus and incentive compensation of $25,000 which represents payment for a performance bonus clause in his individual contract. The bonus is based on Mr. Lowe's performance in several key areas (Tanglewood, Chamber Players, BSO, and general leadership). Other Reportable Compensation includes Other Services in the amount of $25,906.</ExplanationTxt>
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        <TransactionDesc>Engaged to perform concerts</TransactionDesc>
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        <FormAndLineReferenceDesc>Schedule L, Part II</FormAndLineReferenceDesc>
        <ExplanationTxt>On September 12, 1997, a thirty year, $200,000 loan was made to the Managing Director, Mark Volpe. This loan, which is secured by a mortgage on his principal residence, is payable in biweekly installments of principal and interest. During 2003, the loan was refinanced and the term was changed to fifteen years. The interest rate was determined using the IRS approved market rate in effect at the time of the inception and the refinancing of the loan.</ExplanationTxt>
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        <ContributionCnt>2</ContributionCnt>
        <NoncashContributionsRptF990Amt>1701500</NoncashContributionsRptF990Amt>
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        <ExplanationTxt>Column B responses represent the number of contributions.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part I, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>Volunteers comprise the 750 members of the Boston Symphony Association of volunteers (BSAV), who provide a variety of services both at Symphony Hall and Tanglewood; 303 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; 35 voting trustees and 226 non-voting members of the governing body.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <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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      <SupplementalInformationDetail>
        <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 Committee of the Board of Trustees. The Audit Committee reviews each section and the 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 for 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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      <SupplementalInformationDetail>
        <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, Overseers, Ex-Officio board members, members of a committee with board-delegate powers, senior staff members or any person with substantial influence over the BSO to disclose the existence of any potential or actual conflicts of interest of interest to the Board of to members of 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, Overseers, 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 also 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 the Executive Committee as described above.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <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 2016.</ExplanationTxt>
      </SupplementalInformationDetail>
      <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>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VII, Section A, Line 1b</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation reported is based on calendar year 2016 amounts.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VII, Section B, Line 1(C)</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation reported is based on calendar year 2016 amounts.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Line 11g comprises of $14,286,977 of artistic and other concert related fees and $1,969,680 of security, medical, parking, and other services.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Other changes in net assets or fund balances of $18,268,242 comprise of the change in value of the split interest agreements of $700,996 and retirement plan-related charges and other than net periodic benefit costs of $17,567,246.</ExplanationTxt>
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