Now in his late 80s, Mississippi guitarist/vocalist T-Model Ford probably doesn't have much time left on this bad orb, so it behooves lovers of authentic gully blues to catch him in the flesh before it's too late. As his song "I'm Insane" demonstrates, Ford is a tough SOB with the jail time to prove it. The man's built a formidable catalog with raw guitar chordings that hit like bar-brawl uppercuts and a ragged voice that oozes decades of hard living. (Tractor Tavern, 5213 Ballard Ave NW, 789-3599. 9:30 pm, $10, 21+.)