Paul McCartney, Jimmy Fallon, The Roots, and the Cast of ‘Sing’ Perform an A Cappella Rendition of ‘Wonderful Christmastime’

In this clip from tonight’s episode of The Tonight Show, host Jimmy Fallon, The Roots, and the cast of the new animated film, Sing, Reese Witherspoon, Matthew McConaughey, Scarlett Johansson, Seth MacFarlane, and Tori Kelly, join music legend Paul McCartney in singing an a cappella version of his classic 1986 holiday song, “Wonderful Christmastime.”