Music Manuscripts OnlineMusic Manuscripts Online provides access to digitized versions of more than 500 music manuscripts owned by The Morgan Library & Museum. It includes works by J. S. Bach, Beethoven, Brahms, Chopin, Debussy, Fauré, Haydn, Liszt, Mahler, Massenet, Mendelssohn, Mozart, Puccini, Schubert, and Schumann, among many others.