Tenacious D rules. I recommend checking out the live concert DVD from around 2003...Kyle Gass is a pretty technically proficient guitarist and Jack Black, who has obviously become much more famous since the TD halcion days of the '90's and early '00's, is an incredible frontman with good vocal range.
Suggested tracks: Wonder Boy and Tribute
And, I believe that the positioning of the TD guys with the neck of the guitar and the shape of the headstock is meant to possibly represent (ahem...) potency. Am I right about this, mothership?