Charles Olson says

Let’s start from the smallest particle of all, the syllable. It is the king and pin of versification, what rules and holds together the lines, the larger forms, of a poem…. 

It is by their syllables that words juxtapose in beauty, by these particles of sound as clearly as by the sense of the words which they compose. In any given instance, because there is a choice of words, the choice, if a man is in there, will be, spontaneously, the obedience of his ear to the syllables. The fineness, and the practice, lie here, at the minimum and source of speech….

It would do no harm, as an act of correction to both prose and verse as now written, if both rime and meter, and, in the quantity words, both sense and sound, were less in the forefront of the mind than the syllable, if the syllable, that fine creature, were more allowed to lead the harmony on. With this warning, to those who would try: to step back here to this place of the elements and minims of language, is to engage speech where it is least careless—and least logical. Listening for the syllables must be so constant and so scrupulous, the exaction must be so complete, that the assurance of the ear is purchased at the highest—40 hours a day—price. For from the root out, from all over the place, the syllable comes, the figures of, the dance…

I say the syllable, king, and that it is spontaneous, this way: the ear, the ear which has collected, which has listened, the ear, which is so close to the mind that it is the mind’s, that it has the mind’s speed . . .

it is close, another way: the mind is brother to this sister and is, because it is so close, is the drying force, the incest, the sharpener . . .

it is from the union of the mind and the ear that the syllable is born.

But the syllable is only the first child of the incest of verse (always, that Egyptian thing, it produces twins!). The other child is the LINE. And together, these two, the syllable and the line, they make a poem, they make that thing, the—what shall we call it, the Boss of all, the “Single Intelligence.” And the line comes (I swear it) from the breath, from the breathing of the man who writes, at the moment that he writes, and thus is, it is here that, the daily work, the WORK, gets in, for only he, the man who writes, can declare, at every moment, the line its metric and its ending—where its breathing, shall come to, termination….

Let me put it baldly. The two halves are:

the HEAD, by way of the EAR, to the SYLLABLE
the HEART, by way of the BREATH, to the LINE

And the joker? that it is in the 1st half of the proposition that, in composing, one lets-it-rip; and that it is in the 2nd half, surprise, it is the LINE that’s the baby that gets, as the poem is getting made, the attention, the control, that it is right here, in the line, that the shaping takes place, each moment of the going.

I am dogmatic, that the head shows in the syllable. The dance of the intellect is there, among them, prose or verse. Consider the best minds you know in this here business: where does the head show, is it not, precise, here, in the swift currents of the syllable? can’t you tell a brain when you see what it does, just there? It is true, what the master says he picked up from Confusion: all the thots men are capable of can be entered on the back of a postage stamp. So, is it not the PLAY of a mind we are after, is not that that shows whether a mind is there at all?

And the threshing floor for the dance? Is it anything but the LINE? And when the line has, is, a deadness, is it not a heart which has gone lazy, is it not, suddenly, slow things, similes, say, adjectives, or such, that we are bored by?