The collection consists of 79 works by Morton Feldman in either score or part formats (72 scores; 7 sets of parts). All but one item are ink manuscripts on vellum. These served as the masters that Feldman submitted to C. F. Peters and Peters published directly from these masters. Almost all of the manuscripts are in Morton Feldman's hand, except for two scores copied by John Cage and three items in the hand of a music copyist.

Collection of seventeen (and one duplicate) theater broadsides dating from 1790-1868 for performances in Boston, Massachusetts (2), London, England (14), and York, England (1).

Collection of 125 complete pieces of sheet music from European countries: Austria (5), Belgium (6), England (54), France (9), Germany (31), Italy (14), and the Netherlands (5). Most of these include title page illustrations, about 30 of which are in color. The collection includes an additional 24 partial works, most of which consist only of their title pages. The musical content consists of 44 works for solo piano and approximately 75 works for some combination of voice and piano.

The collection contains 37 78 rpm 10-inch recordings, 1 7-inch 78 rpm recording, 1 5-inch 78 rpm recording, and 1 7-inch 45 rpm recording. The recordings are all commercial releases consisting of classical, ethnic, and popular music.

Collection of 92 pieces of sheet music, chiefly from the United States, most with title page illustrations.

The collection contains a small amount of correspondence, concert programs and advertisements, clippings, and photographs.

The collection contains fourteen documents, including twelve letters from Paër to associates and friends and two documents showing his services rendered for the fiscal years 1811 and 1813.

This is the largest collection of Ferdinand Praeger's manuscripts in the world, consisting of approximately 480 works. The majority of the works are for piano, but the collection also includes chamber music for strings, large ensemble works, vocal works, and sketches. The dated works range from 1829-1891, but many works are undated.

The collection contains scores and parts of original compositions and arrangements by Frederick Slee. It also includes transcriptions of works by composers such as J.S. Bach, Mozart, and Haydn, as well as a lesson for recorder.

The collection contains scores and parts of twenty original compositions by Friedrich Otto Trautmann, a composer and organist who lived in Germany and England in the late nineteenth to early twentieth century.