...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 phaseshifted 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 5 for keyboard instrument is based on a rapid eleven-note sequence; the rhythm is simple - all notes are equally long. The process is also relatively swift, taking under four minutes. At the end the B-flat drone falls by a semitone.