In western music there are three different minor scales. These are the pure minor, the harmonic minor and the melodic minor. Each features a slightly different sequence of tones and semitones, as illustrated in these next diagrams using A as the tonic.
A Minor "Pure" Scale
A Minor Harmonic - 7th note sharpened (called the Leading Note):
A Minor Melodic - 6th and 7th notes sharpened when ascending and returned to natural when descending.
Of these three minor scales, the melodic minor is the most commonly used. The following table lists the 13 most commonly used minor scales.