C#(b13b9) Dominant 7th
The C#(b13b9) chord is built from the notes C# – E# – G# – B – D – A.
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Also known as
C#7(b9,b13)C#7b13b9C#7b9b13C#b13b9C#b9b13
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.
BSeventh
Minor seventh (♭7)
Ten semitones — the dominant/minor seventh. Adds bluesy tension (7, m7).
DExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
AExtension
Flat thirteenth (♭13)
A ♭13 — dark altered tension over a dominant chord.
🎼 Related scales
Phrygian dominantharmonic minor a perfect 5th below
🎹 Modal analysis
This chord implies the Phrygian dominant scale; its characteristic note is the ♭9 / ♭2. It is a mode of the harmonic minor a perfect 5th below.
🎸 Genres
Flamenco · Middle-Eastern · Klezmer · Neoclassical metal