The St. James Theatre's been rocking with the sounds of Green Day ever since American Idiot's opening earlier this month. On April 29, the energetic young cast, led by John Gallagher Jr. and Stark Sands, brought their musical mayhem over to the Ed Sullivan Theatre to perform the show's hit song "Holiday" on the Late Show with David Letterman. Not only did the audience go wild, but Dave's reaction shows he's clearly a new fan of Idiot, calling the cast "fun, lively and all-around entertaining". Take a look, and then be sure to schedule a holiday of your own to see the show!