ABSTRACT Artist, educator and film- and video-maker Stuart Marshall (1949–1993) was an important link between the American experimental music of the 1970s and the British visual arts scene of the same epoch. The author looks at one of Marshall’s works, Idiophonics (a.k.a. Heterophonics ), and offers thoughts on the occasion of the 40th anniversary of its presentation in London and Newcastle in 1976.