Rolf Gehlhaar (1943-2019) was an instrumental and electronic music composer, and a pioneer in computer controlled interactive music. He grew up in the US where he studied philosophy and composition at Yale University. In 1967 he moved back to Germany to become Stockhausen’s personal assistant and member of his performing ensemble. In 1969 Gehlhaar co-founded, along with Johannes Fritsch (Metaphon 012) and David Johnson, the Feedback Studios in Cologne, a new-music performance center and publishing house. He later moved to England, where he became in 1979 a founding member of the Electro-Acoustic Music Association and later on senior lecturer in design and digital media. Gehlhaar's compositions include symphonies, instrumental works, experimental and electronic music, interactive computer controlled music and everything in between. The three previously unreleased tracks on this LP only show a glimpse of the versatility of his adventurous and innovative musical ideas.