The Hopkins Symphony Orchestra (HSO) was established in its present form in 1981 by Peabody Conservatory graduate student Catherine Overhauser. This collection consists of promotional flyers and posters, concert programs, and audio recordings of performances by the Hopkins Symphony Orchestra spanning 1986 to 2014. It also includes archived websites from 2015-Ongoing.

Nicholas Maw (1935-2009) was a British composer who taught at the Peabody Institute from 1998 to 2008. The Nicholas Maw papers (approximately 1956-2009) contain manuscripts, scores, and recordings of musical compositions by Maw, including the opera Sophie's Choice. The collection also contains correspondence, programs, reviews, lecture notes, and other personal papers.

Walter Spencer Huffman was a composer and music teacher who studied and served on the faculty of the Peabody Conservatory of Music in the 1940s and 1950s. From 1955 until his death in 2005, Huffman taught music privately in Maryland and continued to compose. The collection consists of holograph scores of approximately 150 works, including chamber music, symphonies, and choral music.