My Morning Jacket 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.
Roger Waters 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.
Ray LaMontagne In 2016, he joined Ray LaMontagne and other members of My Morning Jacket for the Ouroborous tour. Later, in 2018, he appeared on LaMontagne's album Part Of The Light.
Other work Koster has also collaborated with
Neko Case, T Bone Burnett,
City & Colour, Strand Of Oaks,
Carl Broemel, Young The Giant,
Laura Viers,
Sam Outlaw, and Delta Spirit. In 2010, he co-produced the Delta Spirit album
History from Below. Prior to joining My Morning Jacket, Koster worked on several television documentaries as an associate producer, including
Modern Marvels and
Haunted History. == Personal life ==