Koster grew up in Lakewood, Ohio, a city in the Greater Cleveland Metropolitan Area. He attended Lakewood High School, Cleveland Institute of Music and Berklee College of Music.
In 2003, Koster became a member of the band My Morning Jacket. The band's sound, rooted in rock, alternative, and alt-country, is often experimental and psychedelic. The group amassed a large following beginning in the early 2000s, in part due to their powerful live performances. In 2005, their album Z was universally acclaimed as one of the best albums of that year. The band has also been nominated for a Grammy three times in the Best Alternative Music Album category.
In 2017 and 2018, Koster was part of the Roger Waters Us + Them world tour and subsequently appeared in the companion film Us + Them. He had previously performed with Waters when My Morning Jacket backed him at the Newport Folk Festival in 2015…
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