Green Day is a pop punk band consisting of Billie Joe Armstrong (lead vocals, guitar), Mike Dirnt (bass) (born Michael Ryan Pritchard), and Tré Cool (drummer) (born Frank Edwin Wright III). Along with other bands on the Lookout label, they are credited as being the pioneers of the pop punk genre popularizing the genre to the mainstream with 1994's smash album Dookie. Dookie has been certified diamond (10 million copies shipped) in the US since its release.