Green Day is a band.
Green Day is an American punk rock band formed in 1986 by lead vocalist and guitarist Billie Joe Armstrong and bassist Mike Dirnt . For much of the group 's career , the band has been a trio with drummer Tré Cool , who replaced former drummer John Kiffmeyer in 1990 prior to the recording of the band 's second studio album , Kerplunk ( 1991 ) . 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 .