The circle of fifths is a deceptively simple diagram that lays out every musical note, key, three-note chord and scale, and charts the relationship between them. A bit like a musical version of the ...

Key changes - or ‘modulations’, to give them their proper, music theory-professor name - may have become a bit of a pop cliché (picture Westlife stepping off their stools), but knowing how to craft a ...

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.