"Oread" isn't written in a traditional form, but that doesn't mean that it's not interested in sound. In fact, there are sound repetitions just about everywhere you look…or listen, as it were: rhymes ("whirl" and "hurl"), alliteration ("pointed pines"), consonance ("cover us with your pools of fir"). You name it, "Oread" has it.
All of these repetitions, plus the fact that the entire poem is an imperative (also known as a command) make it sound pretty powerful. Almost incantatory, if you ask us. It sounds like our Oread is issuing a powerful magical spell. Whirl up, sea! Whirl your pointed pines! Alohomora! Hey, we never said we were experts in the magic world. But we sure did read Harry Potter.