John Mayer is no Lyle Lovett or Billy Joel. That he has had a string of seriously hot and rich girlfriends is one of the mysteries of the universe.
Oh, and KP has a great rack.
Not to put down Tom Petty, but Bruce Springsteen is one of the most important singer/songwriters alive. Between Born to Run and Born in the USA alone, Springsteen surpasses Petty. Then he has a lot of other great albums like Nebraska.