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Section 8.3 Roman Numerals of Diatonic Seventh Chords

When notating seventh chords with Roman numerals, there are a few conventions to follow. An uppercase Roman numeral means a major triad and a lowercase Roman numeral means a minor triad. Adding “7” after a Roman numeral means there is a minor seventh between the root and seventh of the chord. Therefore, \(\left.\text{V}^{7}\right.\) means a major triad with a minor seventh between the root and seventh and \(\left.\text{vi}^{7}\right.\) means a minor triad and a minor seventh between the root and seventh. Add “M7” for a major seventh chord (e.g., \(\left.\text{I}\text{M}^{7}\right.\)). The half-diminished symbol (\(\left.\text{}^ø{}^{7}\right.\)) means there is a diminished triad with a minor seventh from root to seventh. The diminished symbol (\(\left.\text{}^{\circ}{}^{7}\right.\)) on a seventh chord means the triad is diminished and the distance from the root to seventh is a diminished seventh.

Below are the diatonic seventh chords used in major and minor and their Roman numerals.

Roman numerals for diatonic seventh chords in major
Roman numerals for diatonic seventh chords in minor