While the natural minor and other major scale modes are built on tone and semitone intervals, the distance between the b6 and 7th degrees of the harmonic minor is a minor 3rd, which provides its ...

The Hungarian Gypsy scale is the fourth mode of the double harmonic scale, and is a great choice over minor/major 7th chords.

Harmonic minor keys are used when writing chords. There is another version of the minor key known as the melodic minor. This is used when writing a melody. Each key signature has two possible keys.