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.

Popular music can be categorised into a multitude of genres, but probably the broadest are mainstream pop and R&B. This is the kind of thing you hear on the radio every day, and possibly the genres ...

Don't be afraid. The circle of fifths looks confusing but it's only ever here to help. And a basic understanding of what it's trying to tell you could lead you down a whole new creative superhighway.