Mariah Carey, Jimmy Fallon, The Roots and Kids Perform ‘All I Want for Christmas Is You’ (Video)

Roots make do with simple classroom instruments, and a pop superstar

The Roots don't need guitars and amplifiers for one of the best versions of "All I Want for Christmas is You" we've ever heard.

All they need are simple classroom instruments like recorders and wood blocks, a few kids to sing along, and perhaps a pop superstar.

Mariah Carey joined Jimmy Fallon and The Roots on last night's episode of "Late Night" for a simple and stripped down version of the holiday classic. It worked.