BookatlasPiano Rabbit Hole: Improvisation Theory & Practice
9812 / 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 →

81.22Is that polychord?

If LH C remains and RH D♭ major appears clearly:

yes, it can be heard as:

C-centered bass world + D♭-major upper world.

If very brief:

it may simply sound like chromatic approach harmony.

Again:

duration determines interpretation.