Kyle Richard Gass (born July 14, 1960), also known as KG or Kage, is an American rock musician, singer-songwriter and actor. He is a member of the comedy rock band Tenacious D, winner of a Grammy Award for Best Metal Performance, alongside longtime friend Jack Black. He also has his own super-group called The Kyle Gass Band and he was also a member of the band Trainwreck before it split up in 2011.