brennen
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p1k3-wala

It depends a whole helluva lot what you mean when you say folk, but for wildly varying (and mostly inaccurate) values of same you might try:
* BobDylan* GillianWelch* Smog* WoodyGuthrie* ArloGuthrie* TheBand* NeilYoung* RichardThompson* LeonardCohen* SimonAndGarfunkel* TruckstopHoneymoon / MikeWest (if you can admit that this isn't a novelty act, you're at least halfway to salvation)* JohnnyCash* NekoCase* GregBrown* GlenPhillips* TheGratefulDead* JoshRitter* OldCrowMedicineShow* TheViolentFemmes* TheBeGoodTanyas* [AniDifranco]* BrightEyes (perhaps best taken in small doses)* The ''O Brother, Where Art Thou?'' soundtrack