What is the author's style in Music Lessons by Mary Oliver?

"Music Lessons" is a free verse poem, that is a poem without rhyme (except the last two lines whose rhyming promotes finality) and without regular meter. But the poem does have a kind of 4/4 time—a common time signature in music—since it has four stanzas of four lines (quatrains). The poem makes occasional use of enjambment as in lines 6-7 and 7-8, but why? As Mary Oliver writes in A Poetry Handbook: (1994) "We leap with more energy over a ditch than over no ditch." But an additional reason is that Oliver's enjambed lines make "Music Lessons" consistent, since no line, except the last, ends in the full stop of a period.