7. King Diamond (Kim Bendix Petersen)
Bands: Mercyful Fate (1981-1999), Black Rose (1979-1981), Brats (1981), King Diamond (1985-present)
What can ya' say about the King that hasn't already been said? He has the highest fucking voice in all of metal and maybe even all of music. I'm totally stoked about the king's return, and recent videos show he's still got it. His ability to hit high notes at that kind of age is only matched by the next entry on this list.
Example: King Diamond - Welcome Home