19th Century California Sheet MusicA virtual library of some 2,700 pieces of sheet music published in California between 1852 and 1900, together with related materials such as programs, songsheets, advertisements, and photographs
Art Song CentralFree, printable sheet music for singers and voice teachers browsable by composer, voice type, language and the title of the source. IPA transcriptions are now available for every German, French, Italian and Latin song in the index.
Choral Public Domain LibraryCPDL is an Internet-based free sheet music website which specializes in choral music. Here you will find free choral/vocal scores, texts and translations which can be freely downloaded and used.
MutopiaAll of the music on Mutopia may be freely downloaded, printed, copied, distributed, modified, performed and recorded. These are based on editions in the public domain, and include works by Bach, Beethoven, Chopin, Handel, Mozart, and many others.
Sheet Music Consortiuman open collection of digitized sheet music from several collections including contributions from the Library of Congress, Duke University, Indiana University, Johns Hopkins University, UCLA and the National Library of Australia