1. April Op. 37, no.4 Collection: Music and Performing Arts Library: Historic US Sheet Music (MUXCAT_HUSSM) Contributers: Tschaikowsky, P. (composer) Format: Piano Sheet Music Publication Date: 1899 Call number: M1.A2IP52 -- 1899, no. 282 Location: Music and Performing Arts Library, University of Illinois at Urbana-Champaign
2. Valse Collection: Music and Performing Arts Library: Historic US Sheet Music (MUXCAT_HUSSM) Contributers: Chopin, F. (composer) Format: Piano Sheet Music Publication Date: unknown Call number: M1.A2IP52 -- undated, no. 2377 Location: Music and Performing Arts Library, University of Illinois at Urbana-Champaign