Dutch hard rock / heavy metal drummer.

Koster joined the established band Seducer in 1984 but the line-up was short-lived and the band disbanded the same year. Guitarist Erik Karremann and drummer Jan Kosterthen joined established Rotterdam band Highway Chile. After Highway Chile split in 1990, Koster went on to join STRANGERS AT A WEDDING, before moving on to form hard/glam rock act Sleeze Beez. Koster then founded the Punky hard rock band JETLAND with two of his former BEEZ band mates