Each piece of music, be it a song, symphony or concerto, is written in a specific ‘key’. But what do we mean when we refer to a musical key, why are there 24 of them, and how do composers choose which ...

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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.

Only the order of tones and semitones is different. Both keys have the same key signature, shown here:. Because they share the same key signature and the same notes, it is common to modulate or change ...