Carlos Salzédo (1885-1961) was a French-born harpist, teacher, and composer, who performed with the Metropolitan Opera and founded Trio de Lutéce as well as the Salzédo Harp Ensemble. The collection consists of his own published compositions, annotated scores and arrangements by other composers, and issues of the Eolian Review, for which he served as editor.

Joe Williams (1918-1999) was a celebrated vocalist known for his collaboration with the Count Basie Orchestra, as well as a successful solo career. The Joe Williams annotated scores collection is comprised of over thirty scores.

Julius Rudel (1921-2014) was an opera and orchestra conductor who graduated from the Mannes School of Music in 1942. He served as music director for several organizations, most notably as director and principal conductor for New York City Opera from 1957 to 1979. The collection includes annotated conducting scores, notes, a scrapbook of news clippings, programs and playbills, correspondence, biographical material, and photographs.

Leopold Mannes (1899-1964) was an American musician, educator, inventor, and son of the founders of the Mannes School of Music, David and Clara (Damrosch) Mannes. Leopold Mannes and Leopold Godowsky, Jr. invented Kodachrome color photography. Mannes became president of the Mannes School of Music in 1948. This collection contains music manuscripts of Mannes's compositions, including arrangements of pieces by other composers.

Sylvia Marlowe (1908-1981) was an important mid-twentieth century American harpsichordist. The Sylvia Marlowe collection documents her performance career, predominantly through scores, many inscribed to her by composers. Additionally, photographs and textual publicity materials provide further context for Marlowe's performances and recordings.

Harpsichordist Sylvia Marlowe (1908-1981) contributed to popularizing harpsichord music and promoting new works for the harpsichord in the twentieth century. The collection includes personal correspondence, photographs, clippings and programs, contracts and wills, analog audio reels of important albums Marlowe recorded, and a set of scores of classical pieces set in contemporary popular arrangements composed for Marlowe. The collection also contains correspondence and documents relating to the Harpsichord Music Society (founded by Marlowe) and Kenneth Cooper, its director.

Music manuscripts and books collected by Victor Hammer, including a copy of Ein Beitrag zur Ornamentik by Heinrich Schenker, musical sketches and three books of lute tablature, correspondence of Carolyn Reading Hammer with Clifford Wurfel and Robert Lang of the University of California at Riverside Library, a drawing of Hans Weisse by Victor Hammer, and manuscripts of compositions by Hans Weisse, with dedications to Victor Hammer.