A#7b13

Q: What notes are in the A#7b13 chord?

The A#7b13 chord (A# 7b13) contains: A#, D, E#, G#, F#. Its interval structure is shown above in the Theory section.

Q: How do I build A#7b13 on the keyboard?

Take the root and add the remaining chord tones following the interval formula. The highlight shows chord content, while the inversion control changes which chord tone is in the bass.

Q: Which keys is A#7b13 found in?

The chord acts as a diatonic degree in several keys — they are marked on the circle of fifths in the "Harmonic context" block.

Q: What can I substitute for A#7b13?

A substitution depends on harmonic function and voice leading, not only on shared tones. Computed options appear in the "Substitutions" block and should be checked in context.

A# 7b13

Octaves

Musical context

ChordA# majorTriad

ChordA#7b13A# 7b13

ArpeggioA# majorBroken triad

ScaleA# major7 notes

KeyA# majorMajor key

ProgressionPop axisSequence

How the chord relates to the scale, mode, key and progression.

Theory

General info

Full name: A# 7b13
Symbol: A#7b13
Root: A#
Quality: 7b13

Chord notes

1A#root

3Dmajor 3rd

5E#perfect 5th

b7G#minor 7th

b6F#minor 6th

Functions & resolutions

Stability / tension: Stable — can serve as major tonic
Most common resolutions: D#D# Major FF Major GmG Minor
Unstable degrees: 4D#
b7G#
resolves down to the resolution tonic
Main resolution: A#7b13source
FF Major
Major chord A# is a stable tonic. As tonic it doesn't require resolution, but in a progression context typically moves to IV or V.
Other resolutions: A#7b13source
Deceptive resolution
GmG Minor
As the V degree, a major chord can defy expectations by moving to vi instead of I (deceptive cadence).
A#7b13source
Modal resolution
G#G# Major
In modal context, a major chord can freely move to bVII, bIII, or bVI — characteristic of Mixolydian mode.
A#7b13source
Jazz reharmonization
A#maj7A# Major 7
In jazz, a major chord is enriched to maj7, 6/9, or add9 and can smoothly transition into a ii-V of another key (modulation).
A#7b13source
Functional resolution
FF Major
As the IV degree (subdominant), a major chord can resolve to V or directly to I (plagal cadence).

Substitutions

Tritone substitution: E7E Dominant 7

Features

Character: Dominant, with a lowered 13th
Characteristic interval: Minor 7th (b7), Minor 13th (b13)
Description: The major 3rd and minor 7th preserve dominant function, while b13 lies a semitone above the perfect 5th and permits semitone resolution.
Application: V7b13–i in minor
Altered dominant
Chromatic voice leading

Voicing & structure

Root position

v1A#(A#4)Bass

root

v2D(D5)M3from A#

v3E#(E#5)m3from D

v4G#(G#5)m3from E#

v5F#(F#6)m7from G#

Harmony

Compatible scales

All chord tones are contained in these scales — use them for improvisation.

ScaleD Altered (super Locrian)ScaleF Neapolitan major ScaleF# Lydian augmented ScaleF# Harmonic major ScaleG# Romanian minor ScaleG# Ukrainian Dorian ScaleA# Phrygian dominant ScaleA# Mixolydian ♭6 ScaleD# Harmonic minor ScaleD# Melodic minor

This chord on guitar 🎸

See how A#7b13 looks on guitar.

Explore

Circle of fifths

Highlighted major keys contain this chord among their diatonic harmonies.

Relative key: GmG minor
Dominant: FF major
Subdominant: EbEb major
Key signature: 2 flats (Bb, Eb)

What to learn next

ScaleBb Chromatic scaleScale to improvise over this chord PracticeChord trainerLock the fingering into muscle memory ProgressionChord progressionsHow this chord works inside real progressions

Recommended for you

Bb Chromatic scaleA scale related to this chord

Practice

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What notes are in the A#7b13 chord?

How do I build A#7b13 on the keyboard?

Which keys is A#7b13 found in?

What can I substitute for A#7b13?