A-7#5#9#11 Augmented
The A-7#5#9#11 chord is built from the notes A – C# – E# – G – B# – D#.
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Also known as
A7(#5#9)(#4)
Chord tones, one by one
ARoot
Root
The fundamental note the chord is built on — A.
C#Third
Major third
Four semitones — makes the chord major (brighter, happier).
E#Fifth
Augmented fifth (♯5)
Eight semitones — a sharp fifth. Restless and dreamy, typical of augmented chords.
GSeventh
Minor seventh (♭7)
Ten semitones — the dominant/minor seventh. Adds bluesy tension (7, m7).
B#Extension
Sharp ninth (♯9)
A ♯9 — the gritty 'Hendrix' tension over a dominant chord.
D#Extension
Sharp eleventh (♯11)
A ♯11 — the bright, floating Lydian color.
🎼 Related scales
Altered (super-Locrian)melodic minor a semitone above
🎹 Modal analysis
This chord implies the Altered (super-Locrian) scale; its characteristic note is the ♭13, a dominant's maximum tension. It is a mode of the melodic minor a semitone above.
🎸 Genres
Modern jazz · Post-bop · Fusion