RZA - Wu-Tang, obviously, but the rest of the things he's got his name on are staggering.
Matt Domino - Infest, Neanderthal, Manpig, Low Threat Profile... the guy's a legend.
Chris Dodge - Spazz, No Use For A Name, Infest, Low Threat Profile, Hellnation, Slap A Ham Records... again, a legend.
Al Jourgensen - Like most things he puts his name on.
Tomas Lindberg - At The Gates, Skitsystem, Lock Up, Disfear, The Crown and more. Only one from the list that I've met and he was sound as fuck to boot.