Wild and rhyme-free verse

In this week's poem analysis for Slate, Robert Pinsky illustrates how poems can possess sonic harmony without end rhyme. The robot-enthusiast and former laureate uses Robert Frost's blank verse "An Old Man's Winter Night" and William Carlos Williams' free verse "To Waken an Old Lady" to illustrate his point.

From Slate:

In keeping with my technical theme, both poems are rich in like sounds, certainly richer than many a merely competent poem in end rhyme. For example, in the first couple of sentences in Frost's poem, there's an intricate, expressive dance of the consonants and vowels in eyes, gaze, was, and age. In the sentence beginning "A light he was to no one but himself," the phrases with their varying lengths all end with a T sound: sat, what, light, that.

WCW is also sonorous in his rhymlessness:

Williams, as it happens, also lets the vowel of age chime with another word: glaze, which has the same end consonant sound as trees. Later, broken shares a vowel with snow and a consonant with covered and seedhusks—well, it's clumsy work, trying to trace these audible subtleties. I'll just point to the beauty of "the flock has rested,/ the snow/ is covered with broken/ seedhusks"—without trying to describe any further what we hear: The hearing itself is an action of consciousness, a kind of awakening and of keeping.