I like all the usual suspects from Jesse Fuller to Shaky Horton and Sonny Terry but recently I bought "Mama Says I'm Crazy" on Fat Possum Records (no-one can have too many Mississippi Fred McDowell records!) where he duets with Johhny Woods, a new name to me, they play wonderfully together, especially as the sleeve notes suggest Johnny was unconscious after a moonshine drinking session just before the (field) recording.
RtS
(who never progressed beyond train noises on his gob iron!)