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.

Walter Damrosch (1862-1950) was a Prussian-born American conductor and composer associated with opera and with early radio broadcasts of classical music. This collection contains scores collected and/or used by Damrosch, including his own piano arrangement of a Franz Liszt composition.