Tenacious D is an American comedy rock duo formed in Los Angeles in 1994 by the actors Jack Black and Kyle Gass. Their music showcases Black's theatrical vocal delivery and Gass's acoustic guitar playing. 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, their friendship and cannabis usage, in a style critics have compared with the storyteller-style lyrics of rock opera.