GbØ9 Chord
Chord Tones
| Interval | Note |
|---|---|
| Perfect 1st | Gb |
| Minor 3rd | A |
| Diminished 5th | C |
| Major 9th | Ab |
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Tetrad (four-note chord) rooted on Gb（Chord Tones: Gb, A, C, Ab）
| Interval | Note |
|---|---|
| Perfect 1st | Gb |
| Minor 3rd | A |
| Diminished 5th | C |
| Major 9th | Ab |
