C7(b13) Dominant 7th
The C7(b13) chord is built from the notes C – E – G – Bb – Ab.
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Also known as
Cb13b13
Chord tones, one by one
CRoot
Root
The fundamental note the chord is built on — C.
EThird
Major third
Four semitones — makes the chord major (brighter, happier).
GFifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
BbSeventh
Minor seventh (♭7)
Ten semitones — the dominant/minor seventh. Adds bluesy tension (7, m7).
AbExtension
Flat thirteenth (♭13)
A ♭13 — dark altered tension over a dominant chord.
🎼 Related scales
Mixolydian ♭6 (Aeolian dominant)melodic minor a perfect 5th below
🎹 Modal analysis
This chord implies the Mixolydian ♭6 (Aeolian dominant) scale; its characteristic note is the dark ♭6. It is a mode of the melodic minor a perfect 5th below.
🎸 Genres
Jazz fusion · Modal jazz · Bossa/MPB