21 Century Breakdown

"21 Century Breakdown" is a song by Green Day in the key of B flat major. It was released as the title track of their eighth studio album, "21st Century Breakdown," in 2009. The song was composed by the band's members Billie Joe Armstrong, Mike Dirnt, and Tré Cool. Notable trivia about the track includes its Grammy nomination for Best Rock Song in 2010 and its references to social and political themes. Musically, the melody features a dynamic mix of energetic guitar riffs, melodic verses, and anthemic choruses, showcasing Green Day's signature punk rock sound.