Grutle Kjellson is a Norwegian vocalist and bass player for the progressive viking metal band Enslaved. He is one of only two founding members left in the current line-up with Ivar Bjørnson being the other one. He is the man who appears on the cover of Enslaved's album Eld. Grutle appeared as a guest vocalist on the song High on Cold War on Darkthrone's 2006 EP, Too Old, Too Cold.
Read more: Wikipedia