Plato thought that all music had a positive effect on public morality true or false

FALSE

Explanation:

Plato subjects music to the same severe examination to which the other arts are subjected. In the philosopher's view, there are good and bad harmonies, good and bad rhythms. Certain modes (the Lydian or the Ionic) must be censured because they soften the soul; others (the Doric or Phrygian) should be encouraged, for they exalt the soul and inspire courage. Some rhythms are even prohibited, as are certain instruments and musical innovations. The central idea of the Platonic conception is summed up in a famous and still impressive formula, precisely because of the power it gives to music: “Introducing a new form of music is a change that we must beware of as a global danger. It is that nowhere do the modes of music change without changing the most important laws of the city. ”

i think this is true