1. Ronnie James Dio (the master!!!)
2. Sir Russell Allen
3. Geoff Tate
4. Jeff Scott Soto
5. Devon Graves (aka Buddy Lackey)
honorable mentions: Fish (marillion), Roy Khan, Ian Gillan, Tony Martin, Ray Gillen, Bruce Dickinson, Tori Amos, Cristina Scabbia, Ray Alder, Midnight, David...