Full Concert can be seen here. Was at the concert in Berlin. Great Show!
Tenacious D is an American comedy rock duo that was formed in Los Angeles, California in 1994. Composed of lead vocalist and guitarist Jack Black and lead guitarist and vocalist Kyle Gass, the band has released three albums – Tenacious D (2001), The Pick of Destiny (2006) and Rize of the Fenix (2012).
Definition from Wikipedia – Tenacious D
Thomas Jacob Black (born August 28, 1969), known professionally as Jack Black, is an American actor, comedian and musician.
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