Green Day are an American pop punk band consisting of three core members: Billie Joe Armstrong (guitar, lead vocals), Mike Dirnt (bass) and Tré Cool (drums). Their live backup members are Jason White (guitar), Jason Freese (keyboards, saxophone, trombone), Mike Pelino (guitar) and Ronnie Blake (trumpet).
Green Day were originally part of the punk rock scene at 924 Gilman Street in Berkeley, California. Their early releases for independent label Lookout! Records earned them a grassroots fanbase, some of whom felt alienated when the band signed to a major label. Nevertheless, their major label debut Dookie became a breakout success in 1994 and eventually sold 20 million copies worldwide. As a result, Green Day was widely credited, along with fellow California punk bands The Offspring and Rancid, with reviving mainstream interest in and re-popularizing punk music in the United States. Green Day's immediate follow-up albums didn't achieve the massive success of Dookie, but they were still successful. Their 2004 "punk rock opera" American Idiot reignited the band's popularity, selling 15 million copies worldwide.
The band has sold over 50 million records worldwide, their success has influenced prominent pop punk bands such as Sum 41 and Good Charlotte. Green Day currently have three Grammy Awards under their belt for Best Alternative Album for Dookie, Best Rock Album for American Idiot, and Record of the Year for "Boulevard of Broken Dreams".