C#maj9(#13) Major 7th
The C#maj9(#13) chord is built from the notes C# – E# – G# – B# – D# – Cb.
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Also known as
C#maj9(#15)
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.
B#Seventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
D#Extension
Ninth (9)
A 9th — colorful extension a whole step above the octave.
CbExtension
Extension (22 st)
An upper extension 22 semitones above the root.
🎼 Related scales
🎹 Modal analysis
This chord implies the Bebop dominant scale; its characteristic note is the passing natural 7th (bebop).
🎸 Genres
Bebop jazz · Straight-ahead jazz