C#6/9add15 Major
The C#6/9add15 chord is built from the notes C# – E# – G# – A# – D# – 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
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
A#Extension
Thirteenth (13)
A 13th — full, rich top extension.
D#Extension
Ninth (9)
A 9th — colorful extension a whole step above the octave.
D##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