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I-ii-V-I, I-IV-V-I, I-IV-I-V-I; the circle of fifths progression I-IV-vii°-iii-vi-ii-V-I; and the major-minor parallelism: minor v-i-VII-III equals major iii-vi-V-I; or minor III-VII-i-v equals major I-V-vi-iii. The last of these progressions is characterized by "retrograde" harmonic motion.

Form

Consonance and dissonance

The consonance and dissonance of different intervals

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