I'll start with a few of my favorites. In no particular order

Steve Perry of Journey
Sebastian Bach of Skid Row
Lou Gramm of Foriegner
Freddie Mercury of Queen
Vince Gill
Allison Krauss
John Foggerty of Creedence Clearwater Revival
Ann Wilson of Heart
Brad Delp of Boston
Chris Cornell of Soundgarden and Audioslave
Etta James
Marvin Gaye

and yes I listen to EVERYTHING LOL