Why is poetry developed first among all literary genres?

Music is naturally born in human mind. Birds, trees, rivers, mountains, meadows, wind, rain, hail, anything can cause a tune to be sown on human mind. Human mind will perfect this tune by repeating it. Then it will make a garland of Words out of this thread of a tune, so that it won't be forgotten and it would achieve permanance as a creation, a miniature of a pleasure uniquely destined to the gods. That is how poetry is born, a simple and light procedure which is an enjoyment for the human mind too. If creating poetry had not been such light and delightfully simple, or if it had been a dull and laborious task, poetry would not have developed first among all literary genres.