Top Ten Rock Vocalists

The following offered mainly in addition to the usual suspects already listed like Daltrey, Mercury, Page & Rodgers):
Gary Brooker
Jay Buchanan
Eric Burdon
Jack Bruce
Glenn Hughes (thanks to Nutty)
Janis Joplin
John Kay
Steve Marriott (+1 to Tooblue)
Chris Robinson 
Steven Tyler

Arcam - I think you put your finger on what was jamming me up...the difference between a characteristic style and belting out the occasional rocker.

Dekay - had to look those up...all pseudonyms for George Harrison, I take it.  Very clever.  

At the risk of offending...George, Billy Joel, Elton John and Mark Knopfler as candidates for a top 10 list of rock, hard rock, metal & prog vocalists have me scratching my head.  Each to his own, I guess.  

Agree 100% with bdp's comments about Van Morrison.  Van is the man and one of the most distinctive (and to my mind, best) vocalists in contemporary popular music.  As one of his album titles states, "Born To Sing: No Plan B".  Just not a Rock/Hard Rock/Metal/Progressive singer...more R&B.  

Perhaps this will make the Sage of St. Paul reconsider....

https://www.youtube.com/watch?v=Y7mWFtd-3GI

James Dewar