Poetry is definitely a promise of language in communication because, for most women, a guy could write them a pretty poem with flowery words and just win their hearts. Poetry is strong because it comes straight from the heart. Poets have the uncanny talent of expressing their feelings through words and the words come out so powerful and strong that everyone knows exactly how they were feeling at that time. Poetry is appealing because its words from the heart and to be able the hear the words or to see them written down is a very heart felt thing. To be able to read the written word over and over again makes the poem all the more special.
Songs are exactly the same as poems but they have one thing that makes it better than poetry.
It's set to music. Music allows you to keep the words in your head longer because the music is memorable and it's often easier to remember a rhythm that you heard than it is to remember a group of words. A person can almost tell how the artist is feeling depending on the tone of the music. If the music is hard and jagged then the person my not be in such a good mood or at least not in a loving mood. But if the music is soft and flowing then you know the person is in the mood for lovin'.