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Achilles is killed after 9 years of war
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an organum is a form of early polyphony based on an existing plainsong.
a polyphony is the style of simultaneously combining a number of parts, each forming an individual melody and harmonizing with each other.
a gregorian chant is church music sung as a single vocal line in free rhythm and a restricted scale (plainsong), in a style developed for the medieval Latin liturgy.
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2 is the correct answer, I hope this helps!