harmony

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harmony In music, structure of chords and the relationships between them. The diatonic scale (from one C to the next on a piano, for example) is the basis of chord construction, and a harmonic progression from one chord to the next is defined by the key. The tonic, dominant, and subdominant chords are the primary chords of a key (C, G, and F chords in the key of C). Composers, especially of the 18th and 19th centuries, follow specific rules of harmony. See also scale

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