The collection contains manuscript letters and brief notes from Nadia Boulanger to her former student Charles Bleefield, including a letter of recommendation in 1947 and several brief greetings in the two decades that followed. Also included are invitations to two memorial services for Lili Boulanger and an Igor Stravinsky autograph.

Enrico Caruso (1873-1921) was one of the most popular operatic tenors of his era. After beginning his career in his native Italy, Caruso immigrated to the United States and became a star at the Metropolitan Opera. His papers include manuscript and published scores belonging to Caruso, photographs, correspondence, scrapbooks and clippings about his career, caricatures and other artwork, recordings, and ephemera.

Soprano Phyllis Bryn-Julson taught at the Peabody Conservatory from 1984 to 2017 and is recognized as one of the most authoritative interpreters of vocal music of the 20th century. Her collection contains manuscript and facsimile scores by several notable composers with whom she worked, including Milton Babbitt, Pierre Boulez, Heinz Holliger, and David Del Tredici, as well as correspondence, programs, clippings, photographs, and other documents related to her career.