The major ninth sharp eleventh chord extends maj9 with a raised eleventh (1-3-5-7-9-♯11). The ♯11 is the same pitch class as ♯4, giving a classic Lydian color: floating, modern, and very common in jazz and contemporary film music on Imaj♯11 or IVmaj♯11 contexts.
Construction
Start from maj9 and add ♯11. In Cmaj9(♯11), ♯11 is F♯.
Usage
Lydian vamps, jazz tonic colors, and pop production for “wide sky” major moods.
Examples
- Modal jazz tunes on major or IV chords
- Film scoring for wonder and openness
- Neo-soul keys parts with quartal upper structure
Play
Keep the major third clear; voice ♯11 high; omit the fifth if needed.
Ear-training cues
Major ninth sound with a Lydian ♯11 sparkle on top.
