1024 / 18210 · Module 21 — Reharmonization: Changing the Chords Without Losing the Song← prev⊞ allnext →
21.3Rule 2: preserve the phrase
A cadence is not just a chord.
If the original phrase strongly resolves:
G7 → C
you can decorate that motion, but if you remove all sense of dominant → tonic, the phrase may lose its punctuation.
So ask:
What job is the original chord doing?
before replacing it.