The dominant 9♯5♯11 is a high-energy altered extension chord: the augmented fifth lifts the harmony, while the raised eleventh adds Lydian brightness against the major third. Together with the ninth, it creates a wide, modern dominant sonority that feels both punchy and harmonically advanced. It is most effective when used deliberately—usually shorter moments where the arrangement wants maximum color.
Construction
Practical stack: 1-3-♯5-♭7-9-♯11 (the perfect fifth is omitted by definition). In C9♯5♯11, a common working set is C-E-G♯-B♭-D-F♯. Voice leading matters more than ever because both ♯5 and ♯11 create strong tendency tones.
Usage
Common in jazz, fusion, and neo-soul as a dominant peak color, especially when improvisers lean on whole-step side-slips and Lydian dominant vocabulary. It can also appear as a reharmonization choice on dominant pedals.
Examples
- Fusion horn section hits on dominant stations
- Modern jazz reharmonizations of turnaround bars
- Neo-soul keys pads that emphasize upper-structure color
Play
Anchor 3-♭7, spread ♯5, 9, and ♯11 across registers, and avoid stacking all altered tones in one octave. If the chord sounds harsh, widen spacing and reduce doubling before removing color tones.
Ear-training cues
Hear augmented fifth color combined with third/♯11 Lydian shimmer—that stacked brightness is the hallmark.
