Backstage before the show, Jimmy, Mariah Carey, and The Roots grabbed some instruments you'd find in an elementary school classroom and stopped by the Late Night "Music Room" to sing Mariah's holiday classic, "All I Want For Christmas Is You." (instrument list below) Jimmy Fallon - wood block, tambourine, bass drum, kazoo Mariah Carey - vocals Questlove - wooden clacker w/ afro pick Mark Kelley - Fisher Price xylophone Kamal Gray - recorder James Poyser - melodica Captain Kirk - ukulele Tuba G