9859 / 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 →
81.69Level 34 — sus polychord
Bass C.
Lower: C-G.
Upper: B♭ major.
This is familiar C9sus territory.
Now add a separate C-major middle E only briefly.
The upper B♭ major and C-major identities collide.
This produces dominant/blues tension.