Pinhead Gunpowder is an American punk rock band that formed in East Bay, California, in 1990. The band has consisted of Aaron Cometbus (drums, lyrics), Bill Schneider (bass), Billie Joe Armstrong (guitar, vocals) and Jason White (guitar, vocals) for the majority of its existence. Sarah Kirsch (guitar, vocals), formerly known as Mike Kirsch, was the original guitarist, in place of White, but left the band citing personal differences with Green Day (the band for which Billie Joe Armstrong is most famous) and their major label debut album Dookie (1994). The band's name comes from a brand of "high octane" green tea served at the Arcata co-op and discovered by Aaron Cometbus during one of his many dumpster diving adventures.