C Dominant seventh sharp ninth sharp eleventh flat thirteenth

The 7♯9♯11♭13 dominant is a high-density altered sonority that combines upper brightness with dark side tension. It keeps dominant function but pushes harmonic color close to maximum intensity. This chord is ideal for climactic moments where emotional contrast is more important than smooth neutrality.

Construction

A practical model is 1-3-5-♭7-♯9-♯11-♭13. In C, this can include C-E-G-B♭-D♯-F♯-A♭. In real voicings, 3 and ♭7 anchor function while altered tensions are selected for clarity and impact.

Usage

Common in modern jazz, fusion, and cinematic writing before strong arrivals. Because tension density is high, it works best as a featured dominant event, not as a constant background color.

Play

Separate altered tones across registers and keep the middle range uncluttered. Resolve at least one altered note by semitone to make the harmonic destination feel intentional.

Ear-training cues

Hear ♯9/♯11 as bright lift and ♭13 as dark gravity. The chord's identity comes from this simultaneous pull in opposite color directions.