A6/9add15 Major
The A6/9add15 chord is built from the notes A – C# – E – F# – B – B#.
Piano sound loads on first tap.
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.
F#Extension
Thirteenth (13)
A 13th — full, rich top extension.
BExtension
Ninth (9)
A 9th — colorful extension a whole step above the octave.
B#Extension
Sharp ninth (♯9)
A ♯9 — the gritty 'Hendrix' tension over a dominant chord.
🎼 Related scales
🎹 Modal analysis
This chord implies the Bebop dorian scale; its characteristic note is the passing major 3rd (bebop).
🎸 Genres
Bebop jazz · Straight-ahead jazz