Tenacious D consists of Jack Black (guitar, vocals), Kyle Gass (guitar, vocals).
Tenacious D (sometimes referred to as "The D") is a Comedy rock band comprised of musicians and actors Kyle Gass and Jack Black. They are known for their upbeat classic rock style infused with vulgar comedy. The band first gained reputation in 1999 starring in a self-titled HBO television series during which Black and Gass tried to establish themselves as The D and the "Greatest Band in the World".
16 year-old Jack Black met 24 year-old Kyle Gass in Los Angeles in 1985 when they were both in the " The Actors' Gang" theatre troup. Ironically, Black and Gass actually didn't like each other very much at first, but the two eventually worked out their differences. Later on, Gass taught Black how to play the guitar, and eventually asked him to form a band. While they both sing and play the guitar, Black is noted as the lead singer while Gass is the lead guitarist.
The band started out as a stage act and, after being noticed in an LA nightclub by comedian David Cross, were given a series of comedy shorts on HBO which aired in 1999.
"The D" released Tenacious D (#38 UK), in 2001. For their first album, they enlisted the help of drummer Dave Grohl of Foo Fighters; keyboardist Page McConnell of Phish; guitarist Warren Fitzgerald; and bass player Steve McDonald. The Dust Brothers produced the album. The majority of the songs on their debut album stem from early versions as seen on their HBO television series.
From this album comes the band's signature song " Tribute", a tribute to the "greatest and best song in the world", which according to the duo they once created to outwit the devil (played by Grohl in the video) — but which they have now forgotten. Early versions of the song incorporated guitar riffs borrowed from Led Zeppelin's " Stairway to Heaven", suggesting that the so-called "greatest song" was in fact a rip-off or a cover of that song, but this was dropped for the album version.