3897 / 18210 · Workshop 21 — “Stella by Starlight”: Ambiguous Tonal Center, Non-Diatonic Harmony, and Hearing Function Without a Comfortable Home Key← prev⊞ allnext →
21.15Level 6 — chord identity from 3rd and 7th
In ambiguous harmony, roots alone may not tell enough.
The 3rd and 7th tell you chord quality/function.
A7:
C♯ + G.
A minor 7:
C + G.
One semitone changes the entire directional role.
This is why guide-tone hearing remains central.