Matt Barlow (Iced Earth)
Marcela Bovio (Elfonia)
Mikael Akerfeldt (Opeth)
Mike Patton (Faith No More, etc)
Maynard (Tool)
King Diamond (Mercyful Fate, solo)
Tarja Turunen (Nightwish)
Messiah Marcolin (Candlemass)
Chris Cornell (Soundgarden/Audioslave)
Dani Filth (Cradle of Filth)
James Malone (Arsis)
Bruce Dickenson (Iron Maiden)
Rob Halford (Judas Priest)
Garm (Arcturus, now Ulver)
Cedric Bixler Zavala (At the Drive In/The Mars Volta)
Bono (U2)
Geddy Lee (Rush)
Greg Puciato (The Dillinger Escape Plan)
There are more, but this will do for now.
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