C#maj7#5#9 Augmented
The C#maj7#5#9 chord is built from the notes C# – E# – G## – B# – D##.
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Chord tones, one by one
C#Root
Root
The fundamental note the chord is built on — C#.
E#Third
Major third
Four semitones — makes the chord major (brighter, happier).
G##Fifth
Augmented fifth (♯5)
Eight semitones — a sharp fifth. Restless and dreamy, typical of augmented chords.
B#Seventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
D##Extension
Sharp ninth (♯9)
A ♯9 — the gritty 'Hendrix' tension over a dominant chord.
🎼 Related scales
Lydian augmented ♯2harmonic major scale
🎹 Modal analysis
This chord implies the Lydian augmented ♯2 scale; its characteristic note is the ♯5 alongside the ♯2. It is a mode of the harmonic major scale.
🎸 Genres
Film & TV scoring · Modal jazz · Impressionism