A6/9(#4) Major
The A6/9(#4) chord is built from the notes A – C# – E – D# – F# – B.
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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).
EFifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
D#Extension
Sharp eleventh (♯11)
A ♯11 — the bright, floating Lydian color.
F#Extension
Thirteenth (13)
A 13th — full, rich top extension.
BExtension
Ninth (9)
A 9th — colorful extension a whole step above the octave.
🎼 Related scales
🎹 Modal analysis
This chord implies the Lydian scale; its characteristic note is the bright, floating ♯11.
🎸 Genres
Film & TV scoring · Modal jazz · Impressionism