I was very big on Mudvayne when I was thirteen - I think I still have their L.D. 50 album. I admired them mainly for Ryan Martinie's playing (I was just starting to play bass at the time ;) ), but I do remember being struck by Greg Tribbett's skills as well. There were some great metal riffs on that album, and some cool melody lines as well. In fact, I think I'll go and search for the CD when I log off...