to professionals. But music is a moral discipline and a rational enjoyment (c. 5). By learning music children become better critics and are given a suitable occupation. When of riper age they should abandon music ; professional skill is not for them ; nor should they be taught difficult instruments (c. 6). The various musical harmonies should be used for different purposes. Some inspire virtue, others valour, others enthusiasm. The ethical harmonies are those which children should learn. The others may be left to professionals. The Dorian harmony is the best for education. The Phrygian is bad; but the Lydian may be beneficial to children.