The Library of Congress classification number M1.A1 includes music printed or 'copied in manuscript' in the United States or the colonies through 1820. As an early record of musical life in America and the colonies, this classification number holds many interesting popular and topical pieces.
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.