Editing Heptatonic scale (section)

==Harmonic minor scale==
{{main|Harmonic minor scale}}
[[Image:Amoll.harm.png|thumb|Harmonic minor scale on A {{audio|Amoll harm.mid|Play}}]]
The harmonic minor scale is so called because in tonal music of the [[common practice period]] (from approximately 1600 to approximately 1900) chords or harmonies are derived from it more than from the natural minor scale or the melodic minor scale. The [[augmented second]] between its sixth [[degree (music)|degree]] and its raised seventh degree (the "[[leading-tone|leading tone]]"), traditionally considered undesirable in melodic progression, is avoided by placing these pitches in different voices in adjacent chords, as in this progression: F&nbsp;A{{music|flat}}&nbsp;D, F&nbsp;G&nbsp;B, F&nbsp;A{{music|flat}}&nbsp;C (ii°<sub>b</sub>–V7<sub>d</sub>–iv in C&nbsp;minor). The A{{music|flat}} in the middle voice does not ascend to B, and the B in the upper voice does not descend to A{{music|flat}}.