completely agree w/ Zappa, Prince, Edge (though both Zappa and Prince are certainly technically proficient!)....the others I don't know well
how about also
Joe Walsh
John Butler (check this guy out from down under!...jam band)
Lowell George from Little Feat
Monte Montgomery (if u do not know u gotta check him out: acoustic w/ an attitude)
Peter Frampton (I know, but then again...)
Bonnie Raitt
Tom Petty (when he wants to)
Bruce Springsteen (Bad Lands!)
how about also
Joe Walsh
John Butler (check this guy out from down under!...jam band)
Lowell George from Little Feat
Monte Montgomery (if u do not know u gotta check him out: acoustic w/ an attitude)
Peter Frampton (I know, but then again...)
Bonnie Raitt
Tom Petty (when he wants to)
Bruce Springsteen (Bad Lands!)