Childhood friends Billie Joe Armstrong (guitar, vocals) and Mike Dirnt (bass) formed their first band, Sweet Children, in Rodeo, California when they were 14 years old. By 1989, the newly renamed Green Day independently released their first EP, 1,000 Hours, which was well-received in the punk scene. Soon, the group had signed a contract with the local independent label, Lookout! Records. 39/Smooth, Green Day's first album, was released later that year. Shortly after its release, the band found their permanent drummer, Tre Cool. Throughout the early '90s, Green Day continued to cultivate a cult following, which only gained strength with the release of their second album, 1992's Kerplunk. The underground success led to a wave of interest from major record labels; and the band eventually signed with Reprise. Dookie, Green Day's Reprise debut, was released in the spring of 1994 and went on to sell over 8 million albums in the US. This title carries a parental advisory.