The sounds of words are very important in poetry, oo, ah, sssssss and so on. Think about the sounds that actually make up our language, pretend you teaching a small child how to spell and give the letters their sound not their name.

Now pick some sounds and work with them, make them harsher than normal, alter how loud or soft they are, how long you draw the sound out for.

Now put several sounds together, how do they fit?

Can you get the sounds to express a mood?

Play around with this and you are verging on the world of Tonal Poems were the sound is the main facture.