Ebbie, that would probably be Frost, since Mr. Sandburg didn't seem too fond of form.

There are other ways sounds form patterns in poetry or songs. I suppose every culture develops it's own methods, and makes more or less use of certain things. It probably has to do with the properties of different languages and what kind of work they lend themselves to. If you want to read more on verse construction, you might want to check out something like the Poetry Handbook by Mary Oliver at your local library.