The A♯ mi13♭5 chord is a seven-note chord made up of A♯, C♯, E, G♯, B♯, D♯, and F♯♯. It is built from a root, minor third, diminished fifth, minor seventh, major ninth, perfect eleventh, and major thirteenth.
Construction
A♯ mi13♭5 = Root + Minor 3rd + Diminished 5th + Minor 7th + Major 2nd + Perfect 4th + Major 6th = A♯ · C♯ · E · G♯ · B♯ · D♯ · F♯♯
| Note | Interval | Degree |
|---|---|---|
| A♯ | Root | 1 |
| C♯ | Minor 3rd | ♭3 |
| E | Diminished 5th | ♭5 |
| G♯ | Minor 7th | ♭7 |
| B♯ | Major 2nd | 9 |
| D♯ | Perfect 4th | 11 |
| F♯♯ | Major 6th | 13 |
Key Signature
A chord has no key signature of its own, but the A♯ mi13♭5 is the tonic (I) chord of A# Major, whose key signature has 2 flats (B♭, E♭).
B♭E♭
Order of flats
Flats are added in a fixed order — the reverse of the sharp order. Each new flat key adds the next flat on the list.
B♭E♭A♭D♭G♭C♭F♭
Mnemonic: Battle Ends And Down Goes Charles’ Father
Chords in the Key of A♯ Major
These are the triads built on each degree of the A♯ major scale:
A♯ mi13♭5 — Frequently Asked Questions
What is the A♯ mi13♭5 chord on piano?
The A♯ mi13♭5 chord contains the notes A♯ – C♯ – E – G♯ – B♯ – D♯ – F♯♯. On piano, play these notes together to sound the chord.
What notes are in the A# mi13♭5 chord?
The A# mi13♭5 chord (A#mi13♭5) contains 7 notes: A#, C#, E, G#, C, D#, G. Formula: R-m3-d5-m7-M9-P11-M13.
How is A#mi13♭5 used in music?
A#mi13♭5 is used in jazz, fusion, and contemporary music to add harmonic color. It appears as a dominant or tonic chord depending on context.
What is the scale degree formula for A#mi13♭5?
A#mi13♭5 uses scale degrees 1-b3-b5-b7-9-11-13, giving it its distinctive sound.