Tenacious D is an American comedy rock duo, formed in Los Angeles, California, in 1994. It was founded by actors Jack Black and Kyle Gass, who were part of The Actors' Gang theater company at the time. The duo's name is derived from "tenacious defense" - a phrase used by NBA basketball sportscaster Marv Albert. Prior to the release of Tenacious D's 2001 debut album Tenacious D, the duo had a three-episode TV series released on HBO, with the episodes broadcasting between 1997 and 2000. These episodes came about after the band had met David Cross and Bob Odenkirk on the Los Angeles music scene—and Black featuring in episodes of Mr. Show with Bob and David. The band also befriended former Nirvana drummer Dave Grohl, and this would begin a working relationship between Foo Fighters and Tenacious D. Towards the end of the 1990s, the duo would go on to support large rock acts - such as Pearl Jam, Tool and Beck. Tenacious D's music showcases Black's theatrical vocal delivery and Gass' acoustic guitar playing abilities. Critics have described their fusion of vulgar absurdist comedy with rock music as "mock rock". Their songs discuss the duo's purported musical and sexual prowess, as well as their friendship and cannabis usage in a style that music critics have compared with the storyteller-style lyrics of rock opera