A sharp Dominant ninth sharp eleventh

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.