"Music Room": Backstage before the show, Jimmy, Carly Rae Jepsen, and The Roots grabbed some instruments you'd find in an elementary school classroom and performed "...
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"Katy Perry - Firework (Live on Letterman)"
Buy 'Teenage Dream' on iTunes: http://bit.ly/kpTDdelEX
Music video by Katy Perry performing Firework (Live on Letterman...