A-flat major
| Relative key | F minor |
|---|---|
| Parallel key | A-flat minor |
| Dominant key | E-flat major |
| Subdominant key | D-flat major |
| Component pitches | |
| A♭, B♭, C, D♭, E♭, F, G | |
A-flat major is a major scale based on A♭, with the pitches A♭, B♭, C, D♭, E♭, F, and G. Its key signature has four flats.
The A-flat major scale is:
The A-flat harmonic major and melodic major scales are
Its relative minor is F minor. Its parallel minor, A-flat minor, would require seven flats and is usually written as the enharmonic key of G-sharp minor instead, with five sharps.
In tuning systems where the number of notes per octave is not a multiple of 12, notes such as G♯ and A♭ are not enharmonically equivalent, nor are the corresponding key signatures. These tunings can produce keys with no analogue in 12-tone equal temperament, possibly requiring double sharps, double flats, or microtonal alterations in key signatures.