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 bands Tenacious D and Trainwreck. In Tenacious D (which also features Jack Black), Gass plays lead guitar and sings backup vocals, and also plays the role of Black's comic foil in most of their comedy routines. He is the godfather of Jack Black's son. Kyle Gass was born in Castro Valley, California. Much like his musical career, Gass' acting career also started at a young age. His first gig was for a 7-Up advertisement. Later in his career he met actor Tim Robbins, who recruited him into the Actor's Gang. Gass soon graduated from UCLA. In 1986, a 16-year-old Jack Black was one of the new recruits in the Actor's Gang, and the two were introduced. According to Gass, he actually did not like Black at first, but the duo eventually settled their differences and soon became best friends. Gass taught Black how to play guitar, and the two soon formed the band Tenacious D. Gass was featured in several episodes of the television show Fear of a Punk Planet, which has since been released on DVD.