BandMusic PDF Library preserves and shares band music from the Golden Age of the American Town Band. If you are looking for public domain music to play with your school band, community band or other group, you'll find it here–marches, waltzes, rags, theater music, cornet solos, trombone features, and much more.
The Lester S. Levy Collection of Sheet Music consists of over 29,000 pieces of American popular music. The collection spans the years 1780 to 1980, but its strength is its thorough documentation of nineteenth-century America through popular music. The collection is especially strong in music spawned by military conflicts from the War of 1812 through World War I, and minstrel music is also well represented. Other topics include music about the circus; dance; drinking, temperance, and smoking; fraternal orders; presidents; romantic and sentimental songs; schools and colleges; and transportation.
Part of the Library of Congress American Memory series. Contains over 47,000 pieces of sheet music registered for copyright during the years 1870 to 1885. Included are popular songs, piano music, sacred and secular choral music, solo instrumental music, method books and instructional materials, and music for band and orchestra.
A virtual library of some 2,700 pieces of sheet music published in California between 1852 and 1900 and related materials. University of California, Berkeley.
Art Song Central is principally an archive and directory of free, printable sheet music for singers and voice teachers. An emphasis is placed on standard classical and traditional repertoire.
The Chopin collection at the University of Chicago Library includes over 400 first and early printed editions of musical compositions by Frédéric Chopin.
Begun in December 1998, CPDL is one of the world's largest free sheet music sites. You can use CPDL to find scores, texts, translations, and information about composers.
IMSLP attempts to create a virtual library containing all public domain musical scores, as well as scores from composers who are willing to share their music with the world without charge.
"Online access to the world's most valued music manuscripts and print materials, held at the most renowned music archives, in order to further research and scholarship."
Opera and musical theatre scores (G&S, Kern, Sousa, Herbert) from the University of Illinois, Urbana-Champaign. (This link takes you to the Internet Archive).
A portal to worldwide collections of medieval polyphonic music manuscripts . The music and the manuscripts date from approx 800 to 1500, and the original documents are kept in libraries and archives around the globe. Access is free to anyone, but you must register.