Feast your ears, friends. This is a poem about poetry, and more specifically about meter. Poetry is all about sound, and this poem knows it. While the speaker doesn't talk about sound so much in the first stanza, in the second, he reveals the importance of "sound sense" in the making of a poet. Plus, he totally displays his own "sound sense" in the form of a regular rhyme scheme and things like alliteration and assonance that pop up all over the poem.