Bec. I figure there are people on DU who like/love folk and blues:
The Alan Lomax Sound Archive Now Online: Features 17,000 Blues & Folk Recordings
including:
Mississippi Prison Recordings 1947 and 1948
"The Lomaxes and other collectors of their time (and also decades later) found some of the most powerful vernacular music of the American South in the region’s oppressive and violent prison system."
http://www.openculture.com/2012/03/the_alan_lomax_music_archive_now_online.html