**Repressed!**
Bruce Haack's 'The Electric Lucifer' is rightly considered one of the masterworks of 20th century electronic music. Originally recorded in 1968-69, it's an eminently listenable work where Pop-psychedelia and Moog/musique-concrete sounds coalesce. RIYL Broadcast, Stereolab, Add N to X, Silver Apples, and United States of America!