Paul McCartney fronted an all-star, a cappella version of his holiday classic, the 1979 synth-pop gem "Wonderful Christmastime," Tuesday on The Tonight Show. Jimmy Fallon and the cast of computer-animated musical comedy Sing
This article originally appeared on www.rollingstone.com: See Paul McCartney, ‘Sing’ Cast Perform ‘Wonderful Christmastime’ on ‘Fallon’