In this edition of Jimmy Fallon's ongoing "Famous Song Played with Classroom Instruments" series, British handsome man cabal with angel voices and regrettable tattoos One Direction joined The Roots and the goofy TV host to threaten you with holiday spirit. Santa Claus is coming to town—and he's bringing these scruffy babes with him.

While The Roots are afforded the simple privilege of wearing toned-down holiday sweaters, One Direction and Fallon had something bolder in mind. Looking—and sounding!—good, lads. ;) ;)