Text: The combination of three or more tones played at once. Diatonic c. uses only notes proper to the key. A triad is a chord of three notes in which the lowest is combined with the third and fifth above it. Common c. is a triad in root position. Dominant c. is founded on the dominant of the key. An inverted c. uses a tone other than the root as its lowest tone. Harmony is the study of chords and their relations.

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