Green Day is an American punk rock band formed in 1987. The band consists of lead vocalist and guitarist Billie Joe Armstrong, bassist and backing vocalist Mike Dirnt, drummer Tré Cool and guitarist and backing vocalist Jason White, who became a full member after playing in the band as a session and touring guitarist for 13 years. Cool replaced former drummer John Kiffmeyerin 1990, prior to the recording of the band's second studio album, Kerplunk (1992).