The latest gem to fall out of The Tonight Show is an all-star choir performing an a capella rendition of “Wonderful Christmastime.” The roster includes the cast of the just-released holiday kiddie flick Sing (Matthew McConaughey, Reese Witherspoon, Tori Kelly, Seth MacFarlane), the Roots, Jimmy Fallon, and Paul McCartney of Mannequin Challenge fame. Watch the performance below.