For me, it would have to be Primus. No one mentions Les Claypool's amazing bass fret work. The guy had a 12 string bass custom made for him and he can play that bastard with no problems. If you can play a 12 string like a pro, bass guitar too, you have concured all music bounderies.

The guy is truely amazing though. I remeber reading awhile back that he once tried out for Metallica. They basically said, "you're too good for us, so just leave. You're way too good for us"