As if you thought MySpace music wasn’t big enough they just premiered the second official single of off Green Day’s No.1 debuting album, 21st Century Breakdown. The track, “21 Guns” is the follow up to their chart topping first single, “Know Your Enemy.” The video was shot and directed by Marc Webb who has done music video work for numerous other bands along with a feature film debut in “500 Days of Summer.” Peep the video and make sure to cop 21st Century Breakdown if you haven’t already.