Electronic Scores
Most of these sources are freely available on the Web, with some use restrictions, and can be downloaded with software such as Adobe.
American Memory Project "Performing Arts, Music" contains a variety of links to digitized scores and sound files relating to American music.
Art Song Central Public domain sheet music for singers and voice teachers.
Bicinium: List of Duo Scores Sixteenth- and seventeenth-century scores for two instruments available in .pdf format.
Choral Public Domain Library One of the world's largest free sheet music sites with over 8,000 scores.
Classical Scores Library "Classical Scores Library will contain 400,000 pages of classical scores from both in-copyright and public domain editions. The major composers output is represented, as well as many lesser known composers and works. This release includes 1,262 scores."
Folkinfo.org A large collection of folk music scores.
Mutopia Project A variety of classical music, with .pdf and MIDI files. 911 pieces of music are now available.
O'Neill's Music Of Ireland Celtic sheet music; over 1850 tunes.
Sheet Music Consortium Sheet music collections from several libraries including UCLA, Duke, Indiana, and Johns Hopkins.
Variations A test project of scores digitized for the William and Gayle Cook Music Library at Indiana University.
WIMA: Werner Icking Music Archive Free sheet music files from the RAMA ( Royal Academy of Music, Aarhus ) Music Archives in Denmark