"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. Recordings in the Jukebox were issued on record labels now owned by Sony Music Entertainment, which has granted the Library of Congress a gratis license to stream acoustical recordings." ~ from the website
The recordings include a wide variety of music, operas, ethnic characterizations, comedies, monologues, dialogues, recitations, blues, whistling, speeches, yodeling and more. The recordings are available in streaming audio only, and not available for download.