A-flat major

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.