In his Republic, Plato said that music is a more potent instrument than any other, because rhythm and harmony find their way into the inward places of the soul, on which they mightily fasten, imparting grace, and making the soul of him who is rightly educated graceful, or of him who is ill-educated ungraceful; and also because he who has received this true education of the inner being will most shrewdly perceive omissions or faults in art and nature, and with a true taste, while he praises and rejoices over and receives into his soul the good, and becomes noble and good, he will justify blame and hate the bad, now in the days of his youth, even before he will recognize and salute the friend with whom his education has made him long familiar.
Plato also knew the dangers of “anti-music” or Corybanticism, which perverted rhythms to stimulate the bodily humors in defiance of the good purposes of the muses. Its consequence would be a moral chain reaction, dissonant music deranging society and inverting virtue. The Corybants were priests of the Phrygian goddess Cybele, and their music was atonal, ecstatic, and dissolute. It was inimical to the ideal republic. -George Rutler