by Melissa Donovan on Writing Forward site:
Most writers are primarily concerned with the meaning of the words they choose. Is the language precise and accurate? Do the words provide the best connotation for what the writer is trying to communicate? Does the language show, rather than tell?
But poets take language a step further and push it into the realm of music. Poets care about meaning, precision, and accuracy as well as connotation and imagery. But they also care about how words sound, because musicality is a fundamental feature of poetry.
Poets use various elements of music to compose a poem. But because the written word is read and not heard, some elements of music aren’t available, like pitch and timbre.
Spoken word and performance (or slam) poetry are exceptions, because these works are designed to be heard and can incorporate musical elements that aren’t available to authors who write to be read. But most poets rely on a variety of literary devices and techniques to bring music to their work. Foremost among these are meter, sound, rhyme, repetition, and structure.