Kurt Cobain and Freddy Mercury

My fave deserves a mention
 

Sh*t so many greats, would agree Cobain, Mercury and Morrison have to be up there but if we're talking personal favourites I'm gonna give my honourable mention to Anthony Kiedis.

He can do loud, he can do strong, he can do soft, he can do sexy, he can do rapping, he can do shouting, he can do angry, outraged, and completely in love, he can do dirty, he can do offensive, hell he can even do (amazing) lyrics. Yep I could (and do) listen to him for hours. Don't get me started any more!

Morrison is pretty cool, but not the best.

Axl Rose is my fav frontman. for sure, at least before he became a washed up rehab nightmare.

Billy Corrigan from the Smashing Pumpkins actually gets my vote. I loved that band.

Brandon Boyd-Incubus
and Dustin-Thrice

I would have to agree with the very first person's answer it would have to be Jim Morrison

im gonna get hurt but i dont really like thrice that much i'd go with Aaron Lewis from staind

well, you will all disagree with me but I love Dani Filth's voice.

Kurt Cobain
Layne Staley
Jim Morrisson
Corey Taylor
MikeE.W.Goodman(SikTh)
Greg Puciato(Dillinger Escape Plan)

erm....Most the singers you have all mentioned are good. But you don't rate a singer for the lyrics they sing. Christ if we did that then Jim Steinman (songwriter wrote Bat Out Of Hell!) would be a great singer. But if you've heard him sing, then you will know that he can't. But he is the best songwritter.

Anyway. My fav Rock Singer is MEAT LOAF.
He is the man. He has a very powerful voice, and can pull you into the song.

How could you all forget him?

jim morrison and kurt cobain have been mentioned and thats awsome. they are the best not just because of their vocal abilities, but because they were so revolutionary and different. they broke the mould. other singers of this calibre according to me are...:robert plant(led zeppeling), neil young, cat stevens, mick jagger,singer from yes...(whats his goddamn name?!), bob dylan, phil collinsand all members of the eagles....bar don henley.
these guiys and many more-im too drunk to be specifically specific. but the singers of this day though many are extremely talented dont and cant sing with the....soul? of those men.