If you're one of the fans compulsively checking off the days until Broadway's American Idiot takes the St. James Theatre next month while replaying videos of the cast performing live with Green Day at the 2010 Grammy Awards, we've got a treat for you: a brand-spankin' new music video of the show's signature song "21 Guns"! Filmed during the cast and band's recording session of the hit song in Oakland, California, the video shows off soloists Rebecca Naomi Jones, Christina Sajous, Mary Faber and Tony Award winner John Gallagher Jr., as well as the entire American Idiot cast, as they rock out with Grammy winners Green Day during the private studio session. Enough chatter. Watch the video for yet another rocking reason to get excited about the incoming Idiot!