[187b]
from the grave and acute which were varying before, but which afterwards came to agreement, the harmony was by musical art created. For surely there can be no harmony of acute and grave while still at variance: harmony is consonance, and consonance is a kind of agreement; and agreement of things varying, so long as they are at variance, is impossible. On the other hand, when a thing varies with no disability of agreement, then it may be harmonized; just as rhythm
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