Re: Unsung, underrated six string heroes
Chris Whitley for alt blues & a variety of other genres... He never really settled on a musical style (or record label, for that matter), but did some fantastic work. He also played backing tracks for a few dozen hits - usually on his Style O resonator.
Start with Living With the Law, but do not expect him to stay in that vein.
Passed way too young from lung cancer (going through a pack a gig might have had something to do with that).