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Answer:
In music, an interval cycle is a collection of pitch classes created from a sequence of the same interval class. Imagine starting with a certain note (let's say C) and repeatedly going up by a specific interval (like 3 semitones) until you reach the original note again. The resulting set of pitches forms the interval cycle. For instance, the diminished seventh chord corresponds to C3, while the augmented triad is represented by C4. These cycles play a fundamental role in the harmonic organization of post-diatonic music. Keep in mind that interval cycles assume equal temperament and may not work in other systems like just intonation.