BookatlasPiano Rabbit Hole: Improvisation Theory & Practice
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.