Song Analysis Essays Compare Contrast - The Message in the Music
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You devote a little bit of attention in your conclusion to the human quality of jazz (which expresses "our inner feelings") and rock and roll ("fun music"). If you were to develop your comparison of the two genres further, you might do so by considering the influence of such music on society. This might be one way to discuss the relative importance of the two genres, which the essay does not do. Doing that would give your essay an obvious critical purpose. Of course, you could also discuss the relative importance just in terms of each genre's contribution to music theory or to music generally.