Top 5 Rock n Roll Vocalists

I would pick two "traditional rock" singers:
Robert Plant and Roger Daltry.

Add two more mellow "acoustic rock" singers:
Steve Winwood (very unique tone of voice that I really like) and David Crosby.

And close out the list with Eddie Veder

I agree with some of the usual suspects, in particular Robert Plant, but I never liked Freddy Mercury's singing.

Roger Daltry would also be a frontrunner for me. I'll throw in one wildcard, who has a very unique voice that I really like; Steve Winwood. He lacks the charisma of the great rockers though.