Wow, this is super cool.

Library of Congress National 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.

What a treasure trove of Appalachia, tin pan alley, American folk, comedic skits, political speeches, and more.