Green Day is a country.
Green Day . 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 ) . Green Day 's three follow-up albums , Insomniac ( 1995 ) , Nimrod ( 1997 ) , and Warning ( 2000 ) did not achieve the massive success of Dookie , though they were still successful , with Insomniac and Nimrod reaching double platinum and Warning achieving platinum status .