Todd Lewis (the toadies)
Nikola Sarcevic (Millencolin)
Zach De La Rocha (Rage Against the Machine, One Day as a Lion)
Matt Maheffy (Self)

I'm gonna throw Jack White from The White Stripes/Raconteurs in there. His voice is great and original. a bit of old country music with a newer 'art school' vibe.

Jim Morrison

Tobias Sammet (Edguy)
Steve Perry (Journey)
Lol Mason (City Boy)
Russell Allen (Symphony X)

Bruce Dickinson and Ronnie James Dio

glenn hughes

Dio

Bruce Dickinson

Ian Astbury

Kurt Cobain is the best!

no chance!

Definatively Maynard and Layne are favorites as well as Rob Halford DEFINATIVELY Bon Scott,and Bruce dickinson,im also partial to Steve Tyler (classic aerosmith mostly),Paul Rodgers and Robert Plant.

also like Chris Cornell especially on Audioslaves "I am the highway" and other songs ,and John Garcia of Kyuss,some Kurt Cobain,as his vocals was what i did like about Nirvana,Aaron Lewis of Staind,Sully Erna of Godsmack,Shaun Morgan of Seether,and Phil Anselmo of Pantera

theres probably more,from all generes of rock and metal but cant think of any offhand that really stand out!

Frank Sinatra
Bing Crosby
David Bowie
Layne Staley
Tom Araya
David Gahan