A pentachord is a five-note segment of a scale or tone row.^{[citation needed]} A diatonic scale comprises five non-transpositionally equivalent pentachords rather than seven because the Ionian and Mixolydian pentachords and the Dorian and Aeolian pentachords are intervallically identical (CDEFG=GABCD; DEFGA=ABCDE).^{[original research?]}

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