...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 7 for guitar wholly comprises natural harmonics up to the 7th, higher than in earlier versions. Alternate strings are retuned to an A-minor triad reaching up a minor tenth to Middle C, the intervening strings to the same chord a quarter-tone higher. At first only non-microintervallic notes sound; the reverse is true at the end, the E drone rising a quarter-tone.