7♭5♭9 chord - charango
The 7♭5♭9 chord combines a diminished fifth and a minor ninth. These descending alterations create dark and chromatic tension.
Intervals
| Degree | I | III | ♭V | ♭VII | ♭IX |
|---|---|---|---|---|---|
| Interval | Root | Major third | Diminished fifth | Minor seventh | Minor ninth |
| Semitones | 0 | 4 | 6 | 10 | 13 |
Formula 1 - 3 - ♭5 - ♭7 - ♭9
Theory
The 7♭5♭9 chord accumulates descending tensions. G7♭5♭9 = G-B-D♭-F-A♭. This chord creates a particularly dark and tense sound, often used to resolve to minor chords. It's common in bebop and can serve as a tritone substitution with alterations.
Examples
Example: Do 7♭5♭9
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