I'll go a step beyond Dirk and say the "aural" component is essential to "Poetry".
The trick is, that it is not (and should not be) isolated, but must be integrated with all the other elements of the Poem itself, which is why I often say that the "Form" of each of my poems, (including it's "aural" component), depends on the nature of the Poem's intent.
Morover, though it is common for most poets to concentrate on Image, Metaphore, Similie, Symbolism, Allusion Paradox, Irony and the like to build their poems, too few modern Poet's are aware of the extent to which, assonance, consonance, onomatopea, alliteration, rythem and meter and groupings of sounds can CONTROL the pace and tone of a Poems and thus modify and/or enhance those figures of speech, and the overall meaning, and appeal of the message conveyed.
Never forget, that a "True" Poem is the sum of many parts working together to one end or purpose.
Write On,
Jim Hoye, (JRH)