It is the largest known collection of performances from the loft era in New York City, a significant but under-documented period of jazz history. The recordings collection of ca. 430 items, spanning the period from 1965-1975 (on open reel and cassette) contains unique, unreleased concert recordings, with the exception of a small amount of the collection included in the much-praised box set of Aboriginal Music Society recordings, Father of Origin (Eremite records produced in 2011). The recordings document not only the music of Sultan's own groups, such as the Aboriginal Music Society, but also a wide variety of recordings of other bands at Studio We, at other loft spaces in Lower Manhattan (e.g., Studio Rivbea, Artist House, the Ladies Fort, and Ali's Alley), as well as in Woodstock. In addition, the collection includes paper documentation which is contained in 256 containers, with over 2,800 individual items, including ca. 160 individual photographic prints and 44 contact sheets. Further documentation includes a timeline and calendar with detailed information on performers, repertory, performance locations, etc.

This collection consists of transcripts of seventeen interviews with Esther Hoffman Wexler (1918-2014), conducted by her cousin, Lawrence Freund, between 2012 and 2014. Hoffman, a Canadian-born concert pianist and a longtime piano teacher at the Mannes College of Music (which became a division of The New School in 1989), discusses her life experiences and her career as a musician and as a teacher in New York City and Toronto.

Correspondence, manuscripts, documents, notes, printed material, and photographs of Leonard Altman concerning his work as editor of LISTEN and board member of Carnegie Hall as well as his other professional and personal interests.

The collection of Livingston Gearhart Papers contains prose writings, vitae, correspondence, teaching materials, programs, and clippings.

Research materials relating to the creation and installation of sound sculptures by Max Neuhaus.

Letters of musical composers and performers such as George Gershwin, Douglas Moore, Arnold Schönberg, Arturo Toscanini, Maria Cherubini, Jacques Halévy (F. Halévy), and Gaspare Spontini.

A collection of calendars with music-themed artwork and text, mostly published in the United States and Germany.

The original compositions of Solomon Pimsleur, consisting of over 100 sonatas, suites, etudes, and songs for piano, orchestra and voice. Also included are Pimsleur's arrangements of various musical works, and photodisks and tapes of Pimsleur performing his own works; there are also a few periodical and monograph publications which the composer used as bases for some of his work

Ulysses Kay (1917-1995) was a noted twentieth-century American composer. The collection includes audio reels, biographical materials, correspondence, diaries, phonograph records, photographs, programs, and scores.