Randy Lewis of the Los Angeles Times tours the Library of Congress’ Packard Campus for Audio-Visual Conservation in Culpeper, VA, repository of some 6 million recordings and films of music, and quizzes its staffers on the prospect of this treasure trove being made available on the Internet:
http://www.latimes.com/entertainment/news/la-ca-library-congress-packard-20110508,0,4929059,full.story
Here's a link to the LOC’s National Jukebox of recordings made before 1925:
http://www.loc.gov/jukebox/