C#ma13 Major 7th
The C#ma13 chord is built from the notes C# – E# – G# – B# – D# – F# – A#.
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Also known as
C#maj11add13C#maj7(9,11,13)
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.
F#Extension
Eleventh (11)
An 11th — a suspended, airy color on top of the chord.
A#Extension
Thirteenth (13)
A 13th — full, rich top extension.
🎼 Related scales
🎹 Modal analysis
This chord implies the Ionian (major) scale; its characteristic note is the perfect 4th, what sets it apart from Lydian.
🎸 Genres
Pop · Classical · Gospel