The A♭ Major 7♯5 chord is a four-note chord made up of A♭, C, E, and G.
Construction
A♭ Major 7♯5 = Root + Major 3rd + Minor 6th + Major 7th = A♭ · C · E · G
| Note | Interval | Degree |
|---|---|---|
| A♭ | Root | 1 |
| C | Major 3rd | 3 |
| E | Minor 6th | ♯5 |
| G | Major 7th | 7 |
Key Signature
A chord has no key signature of its own, but the A♭ Major 7♯5 is the tonic (I) chord of Ab Major, whose key signature has 4 flats (B♭, E♭, A♭, D♭).
B♭E♭A♭D♭
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 7♯5 — Frequently Asked Questions
What is the A♭ Major 7♯5 chord on piano?
The A♭ Major 7♯5 chord contains the notes A♭ – C – E – G. On piano, play these notes together to sound the chord.