Mutopia Project
Free, public domain classical and contemporary sheet music
8notes
Sheet music for all major instruments
Historic American Sheet Music
Duke University's digitized collection of sheet music from 1850 to 1920
IMSLP (International Music Score Library Project)
Virtual library of public-domain music scores
Project Gutenberg Sheet Music Project
Digitized musical scores,
Musecore
Musicians sharing music
DIAAM (Digital Image Archive of Medieval Music)
Thousands of medieval music manuscripts
African American Sheet Music
Brown University's collection of African-American sheet music dating from 1850 through 1920
Early American Sheet Music
Library of Congress' collection of music in the United States or the colonies through 1820
Music Treasures Consortium
Library of Congress' collection of the world's most valued music manuscripts and print materials
BandMusic
Band music!
