Tenacious D is an American satirical rock duo formed by musicians and actors Kyle Gass and Jack Black in Los Angeles, California in 1994. Their music fuses vulgar absurdist comedy with rock music in a style that critics have described as "mock rock".

Tenacious D's music showcases Black's theatrical vocals and Gass' acoustic guitar playing abilities. Many of their songs discuss the duo's purported musical and sexual prowess, as well as their friendship and intake of cannabis. Their albums feature absurd and humorous sketches. Music critics have compared the storyteller-style lyrics of their songs to lyrics of rock opera.

The band first gained popularity in 1999 when they starred in the self-titled Tenacious D, a television series on HBO, in which Black and Gass attempted to establish themselves as the "Greatest Band on Earth". The series airs occasionally on Comedy Central and is available on their DVD, The Complete Masterworks. In addition, they have since recorded two albums, and starred in their own movie, Tenacious D in The Pick of Destiny.

Tenacious D (sometimes referred to as “The D” and often introduced as “The Greatest Band in the world. Period.”) is a rock band comprising musician-actors Kyle Gass (aka “KG”, aka “(Rage) Kage”) and Jack Black (aka “JB”, aka “Jables”). They are known for their upbeat classic rock style, infused with comedy . The band first gained reputation in 1999, starring in a self-titled HBO TV series. The drumming on both of their albums was performed by Dave Grohl (of Nirvana , Foo