...until... for melody instrument and drone was conceived in 1972 as a variable piece. It consists essentially of a cycle of pitches, initially highly consonant in super-particular ratios (n:n+1) to a given drone, but gradually increasing in dissonance. At the final, most dissonant stage, a small shift in the drone reveals that the cycle has now become a phase-shifted transposition of the original. This ‘minimal’ composition exists as an instructional text as well as ten realized versions for 1. low instruments (1972), 2. wind trio, violin or viola (1973), 3. North Indian instruments (1974), 4. jazz ensemble (1974), 5. piano (1974), 6. clarinet (1977), 7. guitar (1981), 8. piccolo (1981), 9. fixed media (1995), 10. double bass (2015).

Version 8 for piccolo flute is strongly characterised by difference tones caused by the high given pitches sounding against the drone. Both the composed melody and the difference tones independently follow the compositional principle. The B-flat drone rises at the end by a whole-tone.