Let's see. A quick list for me would be:
Halford, Osbourne, Dickinson, Tate, Mustaine, Hetfield, Araya, Belladonna, Anselmo, Bush, Billy, Schuldiner, Barlow, Neil, LaBrie, Keenan, Zombie, Manson, Owens, Filth, Diamond, Steel, De La Rocha, Stanley, Roth, Bon Jovi, Dio, Davis, Staley, Weiland, Bach, Lawless, Snider, Fair, Byron Davis, Blythe, Howard Jones....
The bolded ones weren't even on this list!!!
I'm with you.
My list would be...
Late 80s / Early 90s James Hetfield
John Bush (Anthrax / Armored Saint)
Lane Staley
Bjorn Strid (Soilwork)
Ronnie James Dio
Rob Zombie
Zak Stevens (90s era Savatage)
Sebastian Bach
Bruce Dickenson
Geoff Tate
James LaBrie
and of course, Jason Kendall from The Asylum, but you guys will be hearing some of that soon enough