I think I would have to edit my list now that I have become an obsessed.....I mean dedicated.....Elton John fan. In fact, I don't even know if I could rate them in any order now. So I'll just say that my top 10 includes (in various order)

Don Henley
Elton John
Russ Lee
Marc Broussard
Jonny Lang
Adele
Kenny Hinson
David Cook
Kelly Clarkson
Whitney Houston

with very very close honorable mentions going to Bono, Bob Seger, Stevie Nicks, Celine Dion, Steve Perry, Bryan Adams, and many more that I'm forgetting I'm sure. lol