That's an impossible question.
By hype you'd have to throw a bunch of people out there - Elvis, Freddie Mercury, Billy Joel, Elton John, John Lennon, Paul McCartney.
If I was saying my favorite, not necessarily the best, it would be Trombone Shorty (Troy Andrews). I was at this concert -
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Check him out, you won't regret it. He's unbelievably talented.