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.

Franz Carl Bornschein (1879-1948) was a composer of more than 200 works, primarily vocal music, and a professor of violin and composition at the Peabody Conservatory. His papers include scrapbooks, clippings, correspondence, photographs, personal papers, manuscript and printed scores, and the personal papers of his wife, Hazel Knox Bornschein.

Joseph Schillinger was a theorist and composer famous for developing the Schillinger System, a method of deconstructing music using geometric phase relationships. The collection contains correspondence, recordings, scrapbooks, photographs, artwork, manuscript scores, and other documents related to his professional and personal life.

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.