Long ago Koos taught himself to play the guitar. In the blooming years of the American and British country- and folkrock he debuted as a bass player in the melodic rockband DECENNIUM. In the 1970s and 1980s this band was popular in the alternative circuit and they released three LPs and a DVD. www.decennium.net
Over the years Koos joined several bands, MIDLIFE CRUISE (Sixties rock) - STICKS & STONES (Blues rock) ) - PADDY'S HEAVY CIRCUS (Irish folk rock) and he was a frequent participant on music sessions.
At the moment Koos is playing in DECENNIUM and THE TUMBLIN' DICE www.thetumblindice.com and of course his music heart beats for the pure 'working man's blues' of MAYTREE RHYTHM BLUES BAND.