Wow! Check this out! All kinds of recordings: music, comedies, literary readings, speeches and more...... waaaaay cool!
http://www.loc.gov/jukebox/
The Library of Congress presents the National Jukebox, which makes historical sound recordings available to the public free of charge. The Jukebox includes recordings from the extraordinary collections of the Library of Congress Packard Campus for Audio Visual Conservation and other contributing libraries and archives.