Just intonation

Just intonation is the tuning of a musical interval without beats. The result is an acoustically pure sound that resonates within the harmonic series. The simplest relationship between pitches in this series can be expressed as small whole number ratios. Musicians in every genre of every era instinctively perform in just intonation.

Just intonation also describes any musical tuning system containing five or more pure intervals within an octave. Elaborate theories and instruments have been constructed in pursuit of a just intonation system that is fully chromatic.

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