A site that includes many different historic collections of sheet music, including African American Sheet Music, 1850-1920, Music for the Nation: American Sheet Music, 1820-1860 and 1870-1855, and more.
The collection houses over 800 bibliographies, lists and files, and is indexed by topic (genre and style subdivisions) and subject (individuals - mostly composers). Some listings also include links to selected Internet resources.
Sheet music from 1780 to 1960. It includes images of music that are in the public domain.
From the Library of Congress American Memory Project, it includes a photo archive and nearly 700 songs they recorded available in MP3 format.