The relative key of a minor scale is a major scale and the relative key of a major scale is a minor scale
A relative key, often called "related major / minor" can be found by the following method:
- The relative minor of a major scale (or chord) is the minor scale that starts with the note that is three semitones below the root note of that major chord
- The relative major of a major scale (or chord) is the major scale that starts with the note that is three semitones above the root note of that minor chord
C major scale is composed of the notes: C D E F G A B
A minor scale is composed of the notes: A B C D E F G,
On a closer inspection, we see that not only do they have the same notes, they are in the same cyclical sequence, just the tonic has shifted down by 3 semitones - (A B C D E F G A B C)
Thus C major and A minor are in a relative key, making C major the relative major of A minor and A minor the relative minor of C major.
Similar pairs are: Cb major / Ab minor, D major / B minor, Eb major / C minor, and so on and so forth, including G major / E minor, F major / D minor, etc
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