Māori poetry was always sung or chanted; musical rhythms rather than linguistic devices served to distinguish it from prose. Rhyme or assonance were not devices used by the Māori; only when a given text is sung or chanted will the metre become apparent. The lines are indicated by features of the music. The language of poetry tends to differ stylistically from prose. Typical features of poetic diction are the use of synonyms or contrastive opposites, and the repetition of key words.