Green Day is a punk rock musical group.
21st Century Breakdown is the eighth studio album by American punk rock band Green Day . Dookie is the third studio album by American punk rock band Green Day , released on February 1 , 1994 , through Reprise Records . Green Day . The band 's eighth studio album , 21st Century Breakdown , was released in 2009 and achieved the band 's best chart performance to date .