This session focusses on Berlin composer Marc Sabat’s pieces using “tuneable intervals”, a harmonic system he has built up and crafted over a rich body of work. He writes: “In John Cage and the Theory of Harmony composer James Tenney described an idea of “harmonic space” — a network of connections between tones, based on frequency interactions which our auditory cognition system automatically recognises. His idea is a development of the tonality diamonds described by Harry Partch and lattices in Ben Johnston’s “extended” just intonation. I call these special, perceptible frequency relationships “tuneable intervals”. Their combinations in various acoustic and electronic constellations form the harmonic basis of my music.”