Ronnie James Dio--Am I that old to be the only one to include this singer who, besides his own band, made the best Rainbow records and the best non-Ozzy Black Sabbath album (which even Ozzy acknowledges to be a great album)?
Paul Dianno--Added great punk energy to early Maiden
Mikael--from the screams of "When" to the heart wrenching "Hope Leaves"
Muhammed from Necrophagist. Low, yet intelligible growls. Isn't enough that he's a world-class shredder.