Bruce Dickinson of Iron Maiden.
Ronnie James Dio of Rainbow, Dio, and the real Black Sabbath.
Thomas Quorthon of Bathory.
Mikael Akerfeldt of Opeth.
Matt Levins of Therion.
Hansi Kursch of Blind Guardian and Demons and Wizards.
Matt Barlow of Iced Earth.
James LaBrie of Dream Theater.
Mikeal Stanne of Dark Tranquility.
Tobias Sammet of Edguy.
Rob Lowe of Candlemass and Solitude Aeternus.
Vibeke Stene from Tristania.
Andreas Hedlund of Vintersorg.
And a major thumbs up to the guy above who mentioned Dan Swano. Nightingale is a truly underated band.
Dishonorable mentions:
Phil Anselmo.
Anders Frieden.
Jamey Jasta.
That guy from Lamb of God.
Alexi Laiho of Children of Bodom.
This folks, is not what metal is supposed to sound like. Call me a rabid fan of the classics and "fantasy" stuff, but overall the people above haven't contributed to anything but their wallets, American rednecks, and anything worthwhile in a long time. As for Anders...In Flames betrayed their style, atmosphere, and roots in turn of trying to pay the bills while making metal. Alexi is a high school dropout who can't do anything else besides make embarassing Hot Topic required music for ignorant teenagers who have no true grasp of musical talent. *jumps on his skateboard*