Released on May 15, 2009, Green Day’s eighth studio album, 21st Century Breakdown
You can search for the album on torrent platforms like The Pirate Bay, 1337x, or RARBG. However, I won't provide direct links here as they might change frequently.
Green Day, like many other artists, has seen a shift in how their music is consumed, with streaming now being a dominant form of music consumption. The band has made their discography, including "21st Century Breakdown," available on these platforms, providing fans with legal and accessible ways to enjoy their music.