Any of Clarence Ashley recordings
Jean Ritchie (same applies)
Doc Watson (yep same applies)
Mose Rager (hard to find because they were never released by a label but if you can get any man they are worth any trouble you have to go through to find)
Dock Boggs (yep any)
Blind Willie Johnson (once again any)
I will finish later. I hate doing this though because I know there are tons that are slipping my mind right now and I will kick myself later.
cya
JT