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Section 7.2 Diatonic Chords in Major

Observe the pattern of diatonic chords in major represented by Roman numerals. (Diatonic means notes within a key signature and can be contrasted with the term “chromatic.”) One sees the pattern M-m-m-M-M-m-\(\left.\text{}^{\circ}{}\right.\) in triad quality.
All diatonic triads in C major
Figure 7.2.1.