21 Guns" is a song by American rock band Green Day. It is the second single from their eighth studio album, 21st Century Breakdown. The single was released through Reprise Records on May 25, 2009 as a digital download and July 14, 2009 as a CD single. The song has been a success on the Billboard Hot 100 chart, peaking at #22 so far, which has become their highest charting single since 2005.
The song is featured on the soundtrack to Transformers: Revenge of the Fallen, which was released on June 23, 2009. (It is featured four times in the film itself.) It became available for download on the music video game series Rock Band on July 7, 2009, along with the songs "East Jesus Nowhere and "Know Your Enemy
The video takes place with the band and the album's two protagonists Christian and Gloria in a white hotel room. The police arrive outside the room and open fire through the window. As bullets rain through the room, the band continues playing. Gloria answers the motel phone and throws it into an aquarium. As the bullets continue to fly and tear apart the room, Christian and Gloria walk toward each other, unharmed by the bullets.