Changes needed for the melodic and harmonic versions of the scale are written in with accidentals as necessary. The A-flat harmonic minor and melodic minor scales are:
Although A-flat minor occurs in modulation in works in other keys, it is only rarely used as the principal key of a piece of music. Some well-known uses of the key in classical and romantic music include:
An early section of the last movement of Beethoven's Piano Sonata No. 31, Op. 110 (although the key signature of this section uses only 6 flats, not 7).
The second Trio in Franz Schubert's Klavierstücke in E-flat major for Piano, D946/2.
Schubert's Impromptu in A-flat major actually begins in A-flat minor, though this is written as A-flat major with accidentals.
The second movement of Ferdinand Ries' Concerto No. 2 for Piano and Orchestra in E-flat major, also written as A-flat major with accidentals.
In Gustav Mahler's Ninth Symphony, there is a particularly aggressive restatement of the introduction of the third movement in A-flat minor.
The first movement of Charles Koechlin's Partita for Chamber Orchestra, Op. 205, is in A-flat minor, and the earlier A-flat-minor portion is written with a 7-flat key signature, but the later A-flat-minor portion is written without any key signature, and uses the necessary flats as accidentals.
It is also used in Frederick Loewe's score to the 1956 musical play My Fair Lady; the Second Servants' Chorus is set in A-flat minor (the preceding and following choruses being a semitone lower and higher respectively).
More often, pieces in a minor mode that have A-flat's pitch as tonic are notated in the enharmonic key, G-sharp minor, because that key has just five sharps as opposed to the seven flats of A-flat minor. However, there may be cases where the A flat minor key with seven flats is preferred due to the frequent use of double sharps at the heads of notes when using the G sharp minor key with five sharps.[citation needed]
In some scores, the A-flat minor key signature in the bass clef is written with the flat for the F on the second line from the top.
Notes
↑An example of this is the bass clef staff of the harp parts in the Jupiter movement of Gustav Holst's orchestral suite The Planets.
References
↑Mahler, Gustav. Symphony No. 9 in Full Score, Dover, ISBN0-486-27492-6 (1993), pp. 116–119.