As we banished strains of lamentation, so we may now banish the mixed Lydian harmonies, which are the harmonies of lamentation; and as our citizens are to be temperate, we may also banish convivial harmonies, such as the Ionian and pure Lydian.

Two remain--the Dorian and Phrygian, the first for war, the second for peace; the one expressive of courage, the other of obedience or instruction or religious feeling.

And as we reject varieties of harmony, we shall also reject the many-stringed, variously-shaped instruments which give utterance to them, and in particular the flute, which is more complex than any of them.

The lyre and the harp may be permitted in the town, and the Pan's-pipe in the fields.

Thus we have made a purgation of music, and will now make a purgation of metres.