Jimmy Fallon, Paul McCartney, and the ‘Sing’ Cast Perform ‘Wonderful Christmastime’ A Cappella

Jimmy Fallon teamed up with The Roots, Paul McCartney, and the star studded cast of Sing to perform an a cappella cover of McCartney's 1979 Christmas song, "Wonderful Christmastime," on a festive episode of The Tonight Show.

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