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 part of The Actors' Gang theater company at the time.
Definition from Wikipedia – Tenacious D
Thomas Jacob "Jack" Black (born August 28, 1969) is an American actor, comedian, and musician. His acting career has been extensive, starring primarily in comedy films.
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