Mariah Carey's "All I Want for Christmas Is You" is one of the countless celeb holiday tunes that has made it onto our permanent Christmas playlist. The diva performed her 1994 track alongside Jimmy Fallon when she appeared on "Late Night With Jimmy Fallon" on Tuesday. As usual, Fallon put his own spin on the song, adding his house band The Roots and a bunch of instruments that you probably haven't seen since grade school music class. Or, if you remember Fallon's collaboration with Carly Rae Jepsen on "Call Me Maybe" in June, since then.
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