The dominant 9♯11 chord extends a dominant ninth with a raised eleventh, producing the characteristic Lydian dominant brightness against the major third. Compared with a plain 9 chord, it sounds wider, more modern, and more “upper-structure forward.” It is a staple when you want dominant function with a melodic top that can sit on the sharp eleven without feeling wrong.
Construction
Practical formula: 1-3-5-♭7-9-♯11 (the fifth is often omitted in real voicings). In C9♯11, a common working set is C-E-B♭-D-F♯ while the root may be shared with the bass. The ninth adds width; the ♯11 defines the Lydian color.
Usage
Very common in jazz, fusion, neo-soul, and modern pop harmony on dominant stations that support Lydian-dominant improvisation. It also works well on static dominant pedals where you want shimmer instead of darkness.
Examples
- Modal vamps on V with Lydian dominant melody notes on ♯11
- Turnarounds where 9♯11 replaces a brighter 13 voicing for a fresher color
- Arranged horn pads that emphasize the upper extensions
Play
Anchor 3-♭7, place 9 and ♯11 in upper registers, and avoid crowding the third octave with too many stacked thirds. If the chord gets sharp-edged, widen spacing rather than removing the ninth first.
Harmonic function in progressions
It still resolves like dominant harmony, but the ♯11 encourages melodic motion that floats upward or side-slips by whole step—useful for modern voice leading that avoids constant half-step clichés.
Ear-training cues
Hear the major third with ♯11 as the bright signature, plus the ninth widening the chord above the seventh.
