Oh my. I have so much to do and then I stumble upon the Music: Digital Library of Appalachia chocked full of mp3s.
DLA music entries are derived from non-commercial sound recordings that document much of Appalachian music's geographic, ethnic, vocal, and instrumental diversity. The several thousand presently available provide an unprecedented resource for study of repertoire, technique, lore, and the musical interchanges among the region's traditional musicians, many of who are no longer living.
There is some mighty digital goodness to listen to if'n ya like the genre. Hat tip to Codewolf .