Actual folk(ish):
Four Nights Drunk (Weavers -- also Three Nights Drunk by others)

Other:
You're the One (Paul Simon)
Two Lovers (Mary Wells)
Two for the Show (Trooper)
8 Days a Week (Beatles)
Hey Nineteen (Steely Dan)
Rocket 88 (Jackie Brentson -- the first rock-n-roll record?)