Swedish composer and musician (trombonist), born 19 April, 1934 in Härnösand, died 27 April, 2012 in Tyresö, Stockholm county.

Bark studied at the Royal College of Music (Kungliga Musikhögskolan), Stockholm.

He began his musical career playing in trad jazz bands, later becoming a teacher of music and an instructor for film editors and cameramen at the Swedish broadcasting network, Sveriges Television.
In 1963 he co-founded Kulturkvartetten, a group of four trombonists, who performed their own theatrical and musical compositions. From the 1960s onwards he was largely active in collaborative events; later becoming interested in films and videotapes, attempting to register cultural undercurrents in social change.