He's entering his fifth decade as one of the leading frontmen in rock and roll. Can you recognize him all decked out in a cap and gown in this yearbook photo?

You know the drill -- of course we're going to give you a couple of clues. This singer worked with four undeniable guitar geniuses over his career, and despite all his success in the music business, it's likely he's made more money in a completely different field.

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