Feeding the soul.

In The Republic, Socrates talks a lot about the elimination and filtering of poetry and music. Personally i believe this would go against what he has written earlier about harmony in the soul. It seem like it would not feel the portion that needs art and expression. This would cause suppression in the soul and cause harmony not to be in the soul, and therefor not in the society. But is this part of art and expression really needed in the soul.