Input (grade 10): Rock On The Net: Green Day Green Day's 2004 rock opera American Idiot reignited the band's popularity with a younger generation, selling five million copies in the U.S.. The band's eighth studio album, 21st Century Breakdown, was released on May 15, 2009.
Output (grade 7): Rock On The Net: Green Day Green Day's 2004 rock opera American Idiot sold five million copies in the United States.