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 band’s career, they have been a trio with drummer Tré Cool, who replaced John Kiffmeyer in 1990 prior to the recording of the band’s second studio album, Kerplunk (1991). Guitarist Jason White, who has been a touring member since 1999, was an official member from 2012 to 2016.

Green Day was originally part of the punk scene at the DIY 924 Gilman Street club in Berkeley, California.