Who Is Green Day? Green Day is an American rock band from East Bay, California. Formed in 1987, the group consists of lead vocalist and guitarist Billie Joe Armstrong, bassist and backing vocalist Mike Dirnt, and drummer Tré Cool. It has sold more than 85 million records worldwide and is one of the world’s best-selling bands of all time. Green Day is widely credited with popularizing punk rock in the mainstream, making them one of the most influential rock bands of the 1990s and 2000s. Early Years Green Day was founded in 1987 by vocalist/guitarist Billie Joe Armstrong and bassist Mike Dirnt. The duo recruited drummer John Kiffmeyer (also known as Al Sobrante) to form their first lineup. The band released their debut EP 1,000 Hours in 1989. They followed it up with their first full-length album 39/Smooth later that year. In 1990, they released their second album Kerplunk, which was an underground success. Mainstream Success The band found mainstream success with the release of their third album Dookie in 1994. The album was certified diamond by the RIAA for selling more than 10 million copies in the United States alone. It also spawned popular singles “Basket Case” and “When I Come Around”, which were both Top 10 hits on the Billboard Hot 100. Dookie won a Grammy Award for Best Alternative Music Album in 1995. Later Career Green Day has released a total of 12 studio albums since then. Their latest album Revolution Radio was released in 2016. In addition to their studio albums, they have also released several compilations, EPs and live albums over the years. They have also collaborated with other artists such as U2, Oasis and The Offspring on various projects throughout their career. Green Day continues to tour extensively and are set to embark on a world tour in 2020.