This passage from "The Rime of the Ancient Mariner" is an excellent example of Samuel Taylor Coleridge's skillful use of sound devices. The lines exhibit the following poetic devices:
Alliteration is the repetition of initial consonant sounds in words in close proximity. In the twenty-three-word excerpt provided in this question, the initial "f" sound is used seven times: fair, foam, flew, furrow, followed, free, and first. Additionally, "silent" and "sea" are alliterative, as are "breeze," "blew," and "burst." Alliteration is a lyrical technique that not only sounds pleasant but also builds cohesion in a passage.
Assonance is similar to alliteration, but it is the repetition of internal vowel sounds. It has a similar effect, increasing the lyrical quality of the text while binding it together. In the excerpt, Coleridge repeats the "ur" vowel sound four times: furrow, were, first, burst. The long "o" sound repeats in the words "foam," "furrow," and "followed."
Rhyme is a sound device that uses assonance or combines assonance and consonance, the repetition of end consonant sounds. Poems often use end rhyme—the rhyming of words at the end of lines. Here Coleridge adds internal rhyme, where a word in the middle of a line rhymes with a word at the end of the line. In the first line of the excerpt, "blew" and "flew" rhyme because they both end with the same vowel sound, /oo/. The third line contains the rhymes "first" and "burst"; the words have the same internal vowel sound and the same final consonant sound, /st/. Finally, lines two and four rhyme, both ending in the long /e/ sound: free, sea.
This stanza is made particularly memorable not simply because of the alliteration, although that is a prominent sound device in the excerpt. The melding of multiple sound devices within a single sentence makes a powerful impact.