The term “vocalist” is key to this question imo. There is a difference between an entertainer, front person, and a “vocalist”. To me—a great vocalist should have great vocal range. I think Dave Grohl is a fantastic musician—but I can’t say that I’ve even been blown away by his vocal range. If I’m just looking at vocal talent—and I’m certainly biased towards the music that I grew up with—the people that come into mind would be Maynard, Staley, Cornell, Vedder, Axl. I think that Amy Lee of evanescence is also being very overlooked here.
My preference of vocalists would be:
Maynard
Cornell
Shirley Manson
Staley
Vedder
Consideration to: Chester Bennington—cant say that i love Linkin park music—but I have been impressed by his vocal range. Reznor—very unique voice and delivery. Chino Moreno—again—unique voice, delivery and a strong vocal range. Amy Lee—beautiful voice with great range.