G sharp Dominant seventh flat ninth flat thirteenth

The dominant 7♭9♭13 is one of the most recognizable “fully altered” dominant flavors: it keeps dominant function with 3 and ♭7, then adds two dark extensions that both love to resolve by semitone. It is less neon-bright than dominants with ♯11 or ♯9, and more focused on shadowed tension and forward pull.

How it’s built

Practical stack: 1-3-5-♭7-♭9-♭13. In C7♭9♭13, a common working set is C-E-G-B♭-D♭-A♭. The fifth is frequently omitted so the altered tones can speak. Many improvisers connect this chord to the half-whole diminished scale family because it matches the altered dominant color set in many tonal contexts.

Usage

Use it when a dominant should sound serious: minor-key cadences, altered V chords approaching i or I, and cinematic harmony that needs weight without turning into a bright Lydian dominant.

Examples

• Jazz standards: altered dominants resolving to minor tonics
• Modern pop production borrowing jazz altered vocabulary in bridges
• Film scores: dominant color for suspense before a harmonic release

Play

Anchor 3-♭7, place ♭9 and ♭13 in different registers, and resolve at least one altered tone chromatically into the next chord. If the voicing feels heavy, drop the root or first—listeners still infer the harmony from guide tones and bass context.