I'm embarassed to say i have only just heard of this really great stoner rock band, one that started off in the hardcore punk vein of the early 90's, but recently have recognised the power of the blues
Neil Fallon (Clutch's lead singer) "We've been really conscious of the blues over the last couple of years, and you have to admit that the blues really is the source of all rock and roll. I think it's important to go to the source to find that inspiration."
They have also made a transition from an angst ridden content in their music to more intelligent
lyrics, about religion, history, mythology etc
They have a massive 12 albums to their name
Their last, from 2007, with the classic name, From Beale Street to Oblivion was produced by Joe Barresi (he's produced the Melvins, Kyuss, Queens of the Stone Age, Tool)
It's got all the abrasiveness of stoner rock, but is retro southern blues to a tee.