Canadian thrash obviously.
EDIT: Btw guys, Dethklok's Dethalbum III is here: http://www.youtube.com/watch?v=zrhsYs_LCgY
I think it's pretty good but not nearly as brutal as its predecessors. The epic songs like The Galaxy and Skyhunter were finally released; Killstrato Abominate, Biological Warfare and The Hammer sound typical, which is good, but overall the album is WAY too Power for Dethklok IMO. But hey, I'm no hater,
"Virando costas ao mundo, Orgulhosamente sós, Glória antiga, Volta a nós"