I hope I do this ok, please let me know of any newbie mistakes....

In no particular order:

Except Mike Patton is number 1
Angela Gossow (formerly Arch Enemy)
Ronnie James Dio (RIP)
Jon Oliva (Savatage, Jon Oliva's Pain, TSO)
Mike Ness (Social Distortion...considered punk, but hey)
Varg Vikerness (Burzum)
Bruce Dickinson
Hansi Kursch (Blind Guardian)
Layne Stayley
Geoff Tate (Queensryche)