Christmas Countdown 2012: 20 days!

While yesterday’s countdown feature was from 1932 — 80 years ago — today’s feature is less than a day old.

Here, talk show host Jimmy Fallon performs All I Want for Christmas Is You with his house band, The Roots, and the hit Christmas song’s original artist, Mariah Carey… and some kids, too! Enjoy! This is fun to watch.

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