7♯5♯9 chord - ukulele
The 7♯5♯9 chord combines two alterations: an augmented fifth and an augmented ninth. This double alteration creates extreme harmonic tension.
Intervals
| Degree | I | III | ♯V | ♭VII | ♯IX |
|---|---|---|---|---|---|
| Interval | Root | Major third | Augmented fifth | Minor seventh | Augmented ninth |
| Semitones | 0 | 4 | 8 | 10 | 15 |
Formula 1 - 3 - ♯5 - ♭7 - ♯9
Theory
The 7♯5♯9 chord accumulates ascending tensions. C7♯5♯9 = C-E-G♯-B♭-D♯. Both alterations create a very unstable sound requiring resolution. This chord is typical of modern jazz and bebop, offering a complex harmonic palette for chromatic improvisations.
Examples
Example: Do 7♯5♯9
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