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A major key and its relative minor share the same key signature but have different tonics (relative minor tonic = 6th degree of major)

Every major key has a relative minor key that uses exactly the same notes (same key signature) but treats a different note as the tonic. To find the relative minor: count 3 semitones (a minor third) down from the major tonic, or count up 6 scale degrees. To find the relative major: count 3 semitones up from the minor tonic. C major and A minor are relative pairs. This relationship is important for: key changes within songs, modal thinking, and understanding which chords are shared between relative pairs.

Examples

C major (0 sharps/flats) and A minor (0 sharps/flats) are relative pairs. The notes C D E F G A B appear in both; only the tonic changes.

Assessment

Find the relative minor of F major, D major, and Ab major. Find the relative major of B minor, C# minor, and G minor.

“The key of A minor is called therelative minorof the key of C because it uses the same notes.”
corpus · michael-hewitt-music-theory-for-computer-musicians · chunk 21