Aaddb9 Major
The Aaddb9 chord is built from the notes A – C# – E – Bb.
Piano sound loads on first tap.
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.
BbExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
🎼 Related scales
🎹 Modal analysis
This chord implies the Double harmonic major (Byzantine) scale; its characteristic note is the ♭9 / ♭2.
🎸 Genres
Flamenco · Middle-Eastern · Klezmer · Neoclassical metal