“This is not the greatest song in the world,” Tenacious D sang on their biggest hit, “No, this is just a tribute.” Ah, but what a tribute. The genius of Jack Black and Kyle Gass — apart from face-melting guitar skills and a lead singer that can sound like the voice of the angels or Satan himself on any given line — has always been their joy in the music: even when it’s not the music they are playing, and even when it was written by someone else. These dudes love rock and roll. That love comes out in their live shows, which tend to be celebrations of their influences as much as they are presentations of music by Tenacious D. Few artists have spent as much time practicing such a wide variety of covers. In that spirit, we’ve collected 10 of their most thrilling performances of other peop...