Green Day is a band.
21st Century Breakdown is the eighth studio album by American punk rock band Green Day . American Idiot is the seventh studio album by American rock band Green Day . Green Day . The band 's rock opera , American Idiot ( 2004 ) , reignited the band 's popularity with a younger generation , selling six million copies in the U.S. . Insomniac is the fourth studio album by American punk rock band Green Day , released on October 10 , 1995 by Reprise Records . Revolution Radio is the twelfth studio album by American punk rock band Green Day , released on October 7 , 2016 , through Reprise Records .