Aw man folks, what about these?
Joan Baez
Bob Dylan
Leo Kottke (best ever)
Jon Prine
John Hartford
And if you can find it, perhaps the true roots of country and folk: Jimmie Rodgers (the old one). Merle Haggard put out a cool LP in '68 of Jimmie Rodgers covers, and you can sometimes find Jimmie Rodgers compilations in good record stores. But the original recordings .. don't know where they are.