The Michael Costa correspondence collection is comprised primarily of letters to nineteenth-century Italian-born British conductor and composer Michael Costa (1808-1884) covering his personal and professional life from 1846-1884 and the years following his death until 1909. The collection also includes a few contracts, receipts, documents, photographs and artefacts related to Costa.

Wilson Stone (1927-2020) was a lyricist, composer, conductor and pianist. He wrote for the Waa-Mu Show as a Northwestern University student. After graduating, he worked as a composer in New York City, where he wrote industrial musicals and composed lyrics for Paramount Studios.