harmony

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In music, the sounding together of notes to produce a chord. Although the term suggests a pleasant or agreeable sound, it is applied to any combination of notes and the chord can therefore be consonant or dissonant. The term also refers to the progression (flow) of chords in a piece of music and the way they relate to each other.

An important contributor to the theory of harmony was Jean-Philippe Rameau. In his Traité de l'harmonie/Treatise on Harmony (1722), he put forward a system of chord classification on which later methods of harmony have been based.

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