The Theater Chamber Players records (1960-2007) include administrative and business documents, correspondence, working files, concert programs, publicity material, photographs, recordings, scores, and reference material.

Series 1 contains documents related to the founding of TCP and its players. Included are basic administrative papers, biographies of players/musicians, and the papers of Dina Koston. Series 2 contains the business records of TCP. These include meeting minutes, fundraising material, grant applications, tax records, musician contracts, licensing agreements, and outreach material. Series 3 contains information about various composers. Included are concert programs and correspondence. Series 4 contains correspondence from composers, members of TCP, and the general public.

Series 5 includes concert programs and working documents related to the planning of each concert. Series 6 contains TCP publicity material, including brochure drafts, clippings, press releases, advertisements, and correspondence relating to PR. Series 7 contains concert programs and loose publications related to TCP performances from 1968 to 2004. Series 8 includes newspaper reviews and other press about TCP performances from 1968 to 1986. Series 9 contains print photographs of TCP members, performances, rehearsals, and travel.

Series 10 contains various recordings of TCP performances between 1960 and 2003. The formats include reel-to-reel tape, audiocassette, CD-ROM, DAT (digital audio tape), and Betavideo. Series 11 includes published and photocopied scores that have been annotated by TCP musicians for performances. Series 12 includes reference publications related to music and performance, including music catalogs and newsletters from publishers.