The A♯ Major 9♯11 chord is a six-note chord made up of A♯, B♯, C♯♯, D♯♯, E♯, and G♯♯.
Construction
A♯ Major 9♯11 = Root + Major 2nd + Major 3rd + Diminished 5th + Perfect 5th + Major 7th = A♯ · B♯ · C♯♯ · D♯♯ · E♯ · G♯♯
| Note | Interval | Degree |
|---|---|---|
| A♯ | Root | 1 |
| B♯ | Major 2nd | 9 |
| C♯♯ | Major 3rd | 3 |
| D♯♯ | Diminished 5th | ♭5 |
| E♯ | Perfect 5th | 5 |
| G♯♯ | Major 7th | 7 |
Key Signature
A chord has no key signature of its own, but the A♯ Major 9♯11 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♯ Major 9♯11 — Frequently Asked Questions
What is the A♯ Major 9♯11 chord on piano?
The A♯ Major 9♯11 chord contains the notes A♯ – B♯ – C♯♯ – D♯♯ – E♯ – G♯♯. On piano, play these notes together to sound the chord.