Arthur Waldeck (1899-1965) was a New York-based voice teacher. The collection consists of Waldeck's letters to and from renowned music theorist Heinrich Schenker (1868-1935), as well as Waldeck's translations into English and heavily annotated copies of Schenker's works, written and published in German.

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.