Green Day emerged from the underground American punk rock scene to be one one of the best selling bands of all time, having sold more than 75 million albums and singles. They have won five Grammy Awards including two Best Rock Albums, Best Alternative Album, Record of the Year 2004 and Best Musical Show Album for their broadway show American Idiot. They are credited with reviving the mainstream punk rock scene throughout the 90’s. Originally called Sweet Children, lead singer and guitarist Billie Joe Armstrong and bassist Mike Dirnt formed the group in 1987 at the age of 15. Before releasing their first album 1990, 38/Smooth with Lookout! Records, the group changed their name to Green Day to avoid confusion with another local band called Sweet Baby. John Kiffmeyer, the band's original drummer, was replaced in 1990 by Tre Cool when Kiffmeyer left the band to attend college. It was not until 2012 that the final member of the band was officially added, guitarist Jason White, after touring with the band for 13 years. In 1992, the album Kerplunk attracted the interest of major record labels, and in 1994, after two years of touring, the band left Lookout! Records for Reprise Records who released Green Day’s first major album, Dookie. The album was recorded in only three weeks and sold over 15 million copies worldwide. There next two albums, Insomniac in 1995 and Nimrod in 1997, while different from their previous style, continued their commercial success. After a two year break, Green Day reformed for Warning in 2000. In 2004, the album American Idiot sold 1.5 million in its first week followed by a world tour lasting 150 dates. The band has continued to tour since, now playing their most recent albums worldwide.