Sing us a song

Billy Joel joins Jimmy Fallon during a taping of "The Tonight Show Starring Jimmy Fallon" at Rockefeller Center on March 20, 2014 in New York City.

( Theo Wargo/NBC / Getty Images for "The Tonight Sh / March 21, 2014 )

Billy Joel joins Jimmy Fallon during a taping of "The Tonight Show Starring Jimmy Fallon" at Rockefeller Center on March 20, 2014 in New York City.

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