Paul Rodgers > all.
All others are number 2 or lower.
http://www.youtube.com/watch?v=LMyv5fhLOLg
He also does a great version of "bad company" in krakow.
I've never heard aerosmith sound good live.
If the guitarist is unable to perform, paul will just pick up the guitar and play it himself.

Paul Rogers is a Damn good singer, best singer STILL is Rob Halford, Judas Priest.
I'm sure Opera vocal coaching when young helped.
Noone can still hit the highs the way he can. Have seen JP too many times to count,
have never heard a flat, off key or scratchy note from any song I heard.
I don't think there's any other singer with the range Halford has. <S> Oz