Full Concert can be seen here. Was at the concert in Berlin. Great Show!
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 members of The Actors' Gang theater company at the time.
Definition from Wikipedia – Tenacious D
Thomas Jacob Black (born August 28, 1969), known professionally as Jack Black, is an American actor, comedian, singer, musician, songwriter, and YouTuber.
Definition from Wikipedia – Jack Black
Kyle Richard Gass (born July 14, 1960) is an American musician and actor best known for being a member of Tenacious D, winner of a Grammy Award for Best Metal Performance, alongside longtime friend Jack Black.
Definition from Wikipedia – Kyle Gass