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 Gooding Jr. - kazoo

Frank Knuckles - bongos

Black Thought - sleigh bells