I'm not including metal - if I did, Bruce D1ckinson would kill everyone else on the list.
* Freddie Mercury (Queen)
* Ian Gillan (Deep Purple)
* Mike Patton (Faith No More etc)
* Layne Staley (Alice in Chains)
* John Fogerty (CCR)
* Brandon Boyd (Incubus)
* Chris Cornell (Soundgarden etc.)
* Eddie Vedder (Pearl Jam)
* Brad Delp (Boston)
* David Bowie
* Steven Wilson (Porcupine Tree)
* Robert Plant (Led Zeppelin)
* Bono (U2)
* Axl Rose (Guns 'n' Roses)
* Bradley Nowell (Sublime)
* Trent Reznor (Nine Inch Nails)
* Jeff Buckley
* Peter Gabriel (Genesis etc)
* John Frusciante (RHCP... he's better than Kiedis)
Ah, meh. I'll do a metal list anyway - not including vocalists who don't use clean vocals much (that's for another list).
* Bruce D
ickinson (Iron Maiden)
* Mikael Akerfeldt (Opeth, Bloodbath)
* Russell Allen (Symphony X)
* Matt Barlow (Iced Earth)
* Daniel Gildenlow (Pain of Salvation)
* Geoff Tate (Queensryche)
* Rob Halford (Judas Priest)
* Devin Townsend (Devin Townsend, SYL)
* Johan Langquist (Candlemass)
* Messiah Marcolin (Candlemass)
* Jonas Renske (Katatonia)
* Phil Anselmo (Pantera)
* Garm (Arcturus, Ulver)
* Hansi Kursch (Blind Guardian)
* Robert Lowe (Solitude Aeturnus)
* King Diamond (King Diamond, Mercyful Fate)
* Tarja Tuurinen (Nightwish)
* Maynard (Tool, APC)
* Ronnie James Dio (Dio)