Brenda Miller Cooper was an American operatic soprano who was a regular performer at New York City Opera from 1947 to the early 1960s. The materials in this collection were compiled by Brenda Miller Cooper during the premiere of Douglas Moore's Pulitzer Prize-winning opera, Giants in the Earth, in 1951 at Columbia University, in which she created the role of Beret.

The Group for Contemporary Music records document the function of an American chamber ensemble dedicated to the performance of contemporary classical music, dating from 1961 to 2012. The records consist of correspondence, photographs, programs, memoranda, schedules, meeting notes, clippings, contracts, bills, financial records, fund raising and grant applications, and so on.

Peter Schickele (b. 1935) is an American composer, music educator, and satirist. He is best known for his comedy pieces composed by the fictional character P.D.Q. Bach. The collection contains manuscript and engraved scores and parts, sketches, revised and annotated copies of Schickele's work. In addition, the collection contains scripts of dramatic pieces or spoken introductions, correspondence, and memorabilia.

Vladimir Rosing (1890-1963) was a Russian tenor, producer, and director (primarily of opera) who worked largely in Britain and the United States. His papers include ephemera relating to his vocal and directorial career, but principally comprises his writings on art and politics, as organized and edited by his wife, Ruth, and son, Richard.