This is the last section of Chromatic Field 82z, completed today. It is the last of a set of 26 pieces in which the performer plays at least one note from each event (events progressing from pairs of notes to chords of 3, 4, 6, 8 and 10 notes).
cf. Material (1960) for any ensemble of harmony instruments by Cornelius Cardew.
ed. Margaret Iversen
Documents of Contemporary Art
pub. Whitechapel Gallery and MIT press
A useful collection of writings on the subject of chance in the arts.