Green Day is an American punk rock band formed in California in the late 1980s around Billie Joe Armstrong, Mike Dirnt and, later, Tré Cool. The band became known for melodic, energetic and often ironic songwriting that blends punk, pop and alternative rock, with lyrics about adolescence, boredom, relationships, society and politics. With landmark albums such as Dookie, Nimrod and American Idiot, Green Day became one of the most popular and influential bands in modern punk rock.