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The correct answer to the question is B. Charlemagne. Charlemagne was not a composer; he was a prominent historical figure known for being the King of the Franks and later crowned as the Emperor of the Romans. He played a significant role in European history during the early Middle Ages, particularly in the Carolingian Renaissance and the expansion of the Frankish Empire. While Charlemagne was a patron of the arts and encouraged learning and culture, he was not involved in composing music.
On the other hand:
A. Pérotin and C. Léonin were both composers from the Notre Dame School of polyphony in the medieval period.
D. Machaut was a composer and poet from the Ars Nova period in the 14th century.
Therefore, the only choice among the options provided that was not a composer is Charlemagne (option B).
