(IM⁷)
* 2nd: minor seventh chord (ii⁷)
* 3rd: minor seventh chord (iii⁷)
* 4th: major seventh chord (IVM⁷)
* 5th: dominant seventh chord (V⁷)
* 6th: minor seventh chord (vi⁷)
* 7th: half-diminished seventh chord (vii^ø7)

Relationship to major keys

If a piece of music (or part