9827 / 18210 · Workshop 81 — Polychords and Bitonal Hearing: Two Harmonic Worlds at Once, Upper Structure vs. True Polychord, Controlled Clashes, and Making “Wrong” Chords Sound Intentional← prev⊞ allnext →
81.37Level 14 — common upper triad across progression
RH:
C major triad.
LH/bass:
A
F
D
G.
Interpretations change:
Am7-ish
Fmaj9-ish
D11-ish
Gsus/13-ish depending supporting tones.
This is familiar.
Now keep RH rhythmically independent so its triadic identity remains perceptible.