If my list included people that most of you have mentioned, it might go on forever, so I'll reduce it to folks who haven't been noted that much (good or bad):
-Bruce Springsteen
-Dave Matthews
-Michael Jackson
-Rufus Wainwright
-Joe Strummer
-Marvin Gaye
-John Popper
-Prince
-Sinead O'Connor
-Cat Power
-David Lee Roth
-Axl Rose
-Indigo Girls
-Pat Benatar
-Odetta
-Roger Daltrey
-James Taylor
-John Fogerty
-John Mayer
-Rob Thomas
-Phil Judd
-Isaac Brock (Modest Mouse)
-Phil Lynott (Thin Lizzy)
-John Kay (Steppenwolf)
-and, of couse, I'll mention my darling Eddie, even though he's been mentioned frequently