A Perfect Circle - i'm sure you've heard of them, and Tool, Maynard is the vocalist of both of those.. and Billy Howerdell (guitarist) has worked with David Bowie and Tool and he wrote basically all the music for A Perfect Circle

Maynard's also worked with Rage, Deftones, .. among others

A Perfect Circle is pretty much my favorite right now... hard to classify what kind of music it is, i don't know, rockish, but very melodic, haha i don't know