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 ...

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 ...