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.

Here’s my go-to practice routine for tackling altered dominant chords—especially those spicy #5/#9 voicings—and the diminished whole-tone scale (aka the 7th mode of the melodic minor). These sounds ...

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