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A7♭9 chord

A Dominant 7th Flat 9

A7b9 · Root

1A33C#45E4b7G4b9Bb4
1C45b7C5C63b9

Every chord tone stacked from the root up.

Click keys to experiment with the chord

Notes

A – C♯ – E – G – B♭

Formula

1 – 3 – 5 – b7 – b9

Practice Note

A flat ninth gives the dominant a strong pull, especially as V7 in a minor key, where Phrygian dominant or the altered scale are common choices. The half-whole diminished scale suits resolutions to major; b9 and the guide tones resolve into the following chord.

Try next

A7 · SimplerA13b9 · RicherA7#9 · SiblingDm · Resolves toEm7b5 · ii in minorBbdim7 · Same notes (upper)

About A7b9

The A7b9 chord sounds dark and dramatic, a staple of minor-key resolutions. Its notes are A, C#, E, G, Bb.

All A chords (61)

Triads

A — MajorAm — MinorAdim — DiminishedAaug — AugmentedAsus2 — Suspended 2ndAsus4 — Suspended 4thA5 — Power Chord

7ths

A7 — Dominant 7thAmaj7 — Major 7thAm7 — Minor 7thAm7#5 — Minor 7th Sharp 5Adim7 — Diminished 7thAm7b5 — Half-Diminished 7thA6 — Major 6thAm6 — Minor 6thA7sus4 — Dominant 7th Sus4A7sus2 — Dominant 7th Sus2

Extended

A9 — Dominant 9thAmaj9 — Major 9thAm9 — Minor 9thAadd9 — Add 9Aadd11 — Add 11Aadd2 — Add 2Aadd#11 — Add Sharp 11A11 — Dominant 11thA13 — Dominant 13thA6/9 — 6/9Amaj13 — Major 13thAm(add2) — Minor Add 2Am(add9) — Minor Add 9Am(add11) — Minor Add 11AmMaj7 — Minor Major 7thAm11 — Minor 11thAm13 — Minor 13thAm6/9 — Minor 6/9A7#11 — Dominant 7th Sharp 11A9#11 — Dominant 9th Sharp 11A13#11 — Dominant 13th Sharp 11A9sus4 — Dominant 9th Sus4A13sus4 — Dominant 13th Sus4Amaj7#11 — Major 7th Sharp 11Amaj9#11 — Major 9th Sharp 11AmMaj9 — Minor Major 9thAm9b5 — Half-Diminished 9th

Altered

A7#9 — Dominant 7th Sharp 9A7b9#9 — Dominant 7th Flat 9 Sharp 9A13#9 — Dominant 13th Sharp 9A7#5 — Dominant 7th Sharp 5A7b5 — Dominant 7th Flat 5A7alt — Altered DominantA7#9#5 — Dominant 7th #9 #5A7b9b5 — Dominant 7th b9 b5A7#9b5 — Dominant 7th #9 b5A7sus4b9 — Dominant 7th Sus4 Flat 9A9#5 — Dominant 9th Sharp 5A9b5 — Dominant 9th Flat 5A13b9 — Dominant 13th Flat 9A7b13 — Dominant 7th Flat 13Aaug7 — Augmented 7thAdim(maj7) — Diminished Major 7thAaugMaj7 — Augmented Major 7th