They're two of pop-rock's elder statesmen, former drug users, Rock and Roll Hall of Famers, multiple-Grammy winners … well, you get the picture. One's an heiress-marrying former Beatle who dabbles passably in oratorios; the other's a wig-wearing Rocket Man who pens smash musicals. Both pop-music legends have ballet projects up and running. Paul McCartney and Elton John - let's dance.
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