A13(b9) Guitar Chord | Play, Hear and Practice Interactively

A 13(b9) position 5 guitar chord diagram

The A13(b9) chord, also read as A thirteenth flat nine, is spelled A, C#, E, G, Bb, D and F#: a root, a major third, a perfect fifth, a minor seventh, a flat ninth, an eleventh and a thirteenth.

The tool shows a single voicing between fret 5 and fret 7, and it is not a barre shape. The A Half-Whole scale, made of alternating half and whole steps, lines up with the chord: it has every chord tone except the eleventh.

The fretboard at the top labels every note of each shape, so you can see where A, C# and Bb fall.

A 13th with flat 9th guitar chord is also written as A13(b9), A13b9 or A13-9.

Notes in the A 13(b9) chord:

A C# E G Bb D F#

How the Dominant Thirteen Flat Nine chord is built:

Formula: 1 3 5 b7 b9 11 13

A 13(B9) Chord Interactive Fretboard

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A 13(B9) Guitar Chord Diagrams

Position 1 Movable

A 13(b9) position 5 guitar chord diagram

Finger Positions

  • Mute the low E string
  • Mute the A string
  • Place your index finger (1) on the fret 5 of the D string
  • Place your middle finger (2) on the fret 6 of the G string
  • Place your ring finger (3) on the fret 6 of the high E string
  • Place your pinky finger (4) on the fret 7 of the B string

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Play This Chord With Other Roots

C 13(b9) | D 13(b9) | E 13(b9) | F 13(b9) | G 13(b9) | A 13(b9) | B 13(b9) | C#13(b9) | D#13(b9) | F#13(b9) | G#13(b9) | A#13(b9) | Ab13(b9) | Bb13(b9) | Db13(b9) | Eb13(b9) | Gb13(b9)

Giancarlo Facoetti, founder of FaChords Guitar

Created by

Giancarlo Facoetti

Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher

FAQ

What notes are in A13(b9)?

A13(b9) is spelled A, C#, E, G, Bb, D and F#. It stacks a major third, perfect fifth, minor seventh, flat ninth, eleventh and thirteenth over A.

How many ways are there to play A13(b9)?

One valid voicing is on record for A13(b9). It uses no open strings and no barre, and it sits between frets 5 and 7.

Which scale fits A13(b9)?

The A half-whole scale covers all chord tones except the eleventh, D. It includes the flat ninth Bb and the thirteenth F#.

What is the flat ninth in A13(b9)?

It is Bb, one half step over the root A. The natural ninth would be B, so lowering it makes the chord darker and more tense.