High Quality Content by WIKIPEDIA articles A tone cluster is a musical chord comprising at least three consecutive tones in a scale. Prototypical tone clusters are based on the chromatic scale, and are separated by semitones. For instance, three adjacent piano keys (such as C, C♯, and D) struck simultaneously produce a tone cluster. Variants of the tone cluster include chords comprising consecutive tones separated diatonically, pentatonically, or microtonally. On the piano, such clusters often involve the simultaneous striking of successive white or black keys.
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