Kjetil Tvedte Grutle, better known as Grutle Kjellson, is a Norwegian musician, best known as the bassist and vocalist of the Norwegian extreme metal band Enslaved. Kjellson and guitarist Ivar Bjørnson are the founding and only constant members of the band, as well as the main songwriters. He has released sixteen studio albums with Enslaved and won five Norwegian Spellemann Awards with the band.

Metalocalypse is an American musical adult animated television series created by Brendon Small and Tommy Blacha for Adult Swim. It premiered on August 6, 2006. The television program centers on the larger-than-life melodic death metal band Dethklok, and often portrays dark and macabre content, including such subjects as violence, death, and the drawbacks of fame, with hyperbolic black comedy. The show was widely heralded as both a parody and a pastiche of heavy metal culture.