Who is the demon in the video for tribute by jack black?

In the music video for "Tribute" by Tenacious D, Jack Black plays the role of a rock star recounting a legendary encounter with a demon. The demon is portrayed by Dave Grohl, the frontman of Foo Fighters and former drummer of Nirvana. Grohl's character is depicted as a powerful and menacing figure, challenging Black and his bandmate Kyle Gass to a musical duel. The video combines humor and rock elements, showcasing the band's signature style.