Fonds consists almost entirely of materials created or acquired by Harry Adaskin throughout his life and career. It includes the manuscripts for his autobiographies, correspondence, scripts for radio broadcasts and lectures, newspaper clippings, and concert programmes, photographs, films, and audio recordings. Also included are annotated copies of Adaskin's two autobiographies: A Fiddler's World (published in 1977), and A Fiddler's Choice (1982). Some outside correspondence addressed to his wife Frances after his death is also included. The fonds is organized in the following series: Autobiographies, Hart House String Quartet, Harry and Frances (Marr) Adaskin Concerts, Musically Speaking Scripts, New York Philharmonic Broadcasts, Tuesday Night Scripts, Miscellaneous Writings, Correspondence, Audio Tapes, Autographed Photographs, Audio Discs, and Film.

The fonds consists of eleven audiotapes, comprising over four hours of interviews with well-known Canadian artists, including B.C. Binning and Jack Shadbolt. The fonds consists of a single audiotape series, arranged alphabetically. In these interviews, Adaskin examines each artist's unique creative process through probing and often unorthodox questions.