Follow the exploits of Jack Black and Kyle Gass, the two halves of Tenacious D, the self-proclaimed "greatest band on earth." Their music is heavy on power chords and lyrics about sex, Satan, and why they are the greatest band … Jack Black, Kyle Gass, Kirk Ward, JR Reed, Laura Kightlinger, Laura Milligan, Ernest M. Garcia Added on HBO 2023-06-27.