Original: While this definition encompasses many scales and modes such as Dorian mode and the Phrygian mode , the term in its stricter sense is usually limited to the natural minor , harmonic minor , and melodic minor scales , described below , which are in most common use in Western classical music ( see major and minor ) .
Simplified: Major and minor keys that share the same key signature are called relative ; so C major is the relative major of A minor , and C minor is the relative minor of E major .