A(b13b9) Dominant 7th
The A(b13b9) chord is built from the notes A – C# – E – G – Bb – F.
Piano sound loads on first tap.
Also known as
A7(b9,b13)A7b13b9A7b9b13Ab13b9Ab9b13
Chord tones, one by one
ARoot
Root
The fundamental note the chord is built on — A.
C#Third
Major third
Four semitones — makes the chord major (brighter, happier).
EFifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
GSeventh
Minor seventh (♭7)
Ten semitones — the dominant/minor seventh. Adds bluesy tension (7, m7).
BbExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
FExtension
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