Robert William Service's "Your Poem" is a simple A-B-A-B rhyme. The metaphors are straightforward and accessible. Still, it expresses something about poetry that I believe deeply. It's not just what's on the page, but what we bring to the reading. (What's the tone of the poem? Does it change, even slightly, based on how we read it?)
And what of the sound itself? The meter and rhyme scheme affect how we read -- yet that's not all there is. You can play with individual words quite a bit without destroying the effect of the rhyme scheme.