Digital Library of Appalachia
http://www.aca-dla.org/dlamusic/dlamusic.html

Fiddler's Companion Alphabetical Files
http://www.ibiblio.org/fiddlers/FCfiles.html

Missouri Traditional Fiddle and Dance Network
http://fiddle.missouri.org/music/

Old Time Key Of C Fiddle Tunes
http://slippery-hill.com/c/

Internet Archive filtering for "old time Appalachian"
http://www.archive.org/search.php?query=subject:%22Old-Time%20Appalachian%22

Field Recorders Collective
http://www.fieldrecorder.com/