A# Dominant Thirteen Flat Nine Guitar Chord Charts & Variations

The A#13(b9) chord, also read as A# thirteenth flat nine, is spelled A#, C##, E#, G#, B, D# and F##: a root, a major third, a perfect fifth, a minor seventh, a flat ninth, an eleventh and a thirteenth.

The double sharps are only the result of stacking thirds above A#. The same pitches appear as Bb13(b9), so the two names sound identical. Over it, the A# Half-Whole scale, which alternates half and whole steps, has every chord tone except the eleventh.

The flat ninth B sits a half step above the root A#, and that close clash is the source of the tension.

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

Notes in the A# 13(b9) chord:

A# C## E# G# B D# F##

Tones in the Dominant Thirteen Flat Nine chord:

#11

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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)

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Created by

Giancarlo Facoetti

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

FAQ

What notes are in A#13(b9)?

A#13(b9) contains A#, C##, E#, G#, B, D# and F##. Those are the root, major third, perfect fifth, minor seventh, flat ninth, eleventh and thirteenth.

Is A#13(b9) the same chord as Bb13(b9)?

Yes, both names describe the same pitches. Bb13(b9) spells them Bb, D, F, Ab, Cb, Eb and G, which needs no double sharps and is easier to read.

Why does A#13(b9) include C## and F##?

Chord notes are named by stacking letters in thirds from A#. The third falls on C and the thirteenth on F, and both must be raised twice to give the right major intervals.

Which scale suits A#13(b9)?

The A# half-whole scale covers every chord tone except the eleventh, D#. Its alternating half step and whole step pattern supplies the flat ninth, B.