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Tré Cool became Green Day's drummer in late 1990 after Sobrante left in order to go to college.
Cool made his debut on Green Day's second album, Kerplunk (1991).
His mother worked as waitress at Rod's Hickory Pit restaurant in El Cerrito, where Armstrong and Dirnt played their first gig in 1987.
Armstrong's great-great-grandparents Pietro Marsicano and Teresa Nigro were Italian immigrants from Viggiano, Basilicata who moved to Berkeley, California in the mid-19th century.
In 2004, Green Day debuted American Idiot, their first rock opera.
The album has sold more than 15,000,000 copies worldwide, fueled by the hit singles "American Idiot", "Boulevard of Broken Dreams" and "Wake Me Up When September Ends".
Oct 1999 - Settled a million libel lawsuit over a headline in the National Examiner that read "Cops Think Kato Did It." Although the paper says "it" meant perjury, the court didn't agree and awarded in the honor of Kaelin.
They changed their name to Green Day in April 1989, choosing the name because of their fondness for marijuana.
In 1986, aged 14, Armstrong formed a band called Sweet Children with his childhood friend Mike Dirnt.
In the beginning, Armstrong and Dirnt both played guitar, with Raj Punjabi and Sean Hughes on bass.
Along with Hillcrest Elementary, Armstrong attended Carquinez Middle School and John Swett High School, both in Crockett, and later transferred to Pinole Valley High School in Pinole.
On his 18th birthday (February 17, 1990), he dropped out to pursue his musical career.