Green Day is a punk rock musical group.
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 . Dookie is the third studio album by American punk rock band Green Day , released on February 1 , 1994 , through Reprise Records . Green Day . The group has won five Grammy Awards : Best Alternative Album for Dookie , Best Rock Album for American Idiot , Record of the Year for `` Boulevard of Broken Dreams '' , Best Rock Album for the second time for 21st Century Breakdown and Best Musical Show Album for American Idiot : The Original Broadway Cast Recording .