Varied and often shameful! Roots:Candlemass Metallica W.A.S.P. Dio Beastie boys! Ministry Carcass Megadeth Sanctuary doors Testament Pearl jam Manowar! Slayer Maiden Sepultura Pantera levellers Obituary Suicidal tendencies Faith no more Sabbath Skyclad Kreator. More current:Senser Deftones At the gates Carcass(deserve a second mention!) Mastodon Burnt by the sun Soulfly Death Wu-tang-clan White zombie(and of course the man himself!) Wolfmother The Black keys Botch Nevermore M.O.P. Devin Townsend(and all related) Machine Head Gojira Enya! Boo yaa tribe Gojira again Incubus Bloodhound gang Static x.
Robin Hobb Rayond E Feist Poppy Z Bright Robert Jordan Tolkien George R R Martin plus many others (I think you get the picture!)