Euphony is using several words with long vowels rather than short vowel sounds in the line of a poem, such as including words like "rain" and "day." Another example is using words that rhyme with each other or have similar sound patterns, such as those starting with the same sounds, throughout literary prose. The purpose of euphony in literature is to be melodious and avoid using sounds that are harsh.
Although vowels are emphasized with euphony, certain consonants are also effective. Some of these include the letters "f," "v," "y," "w," "l," "r" and "m." John Keats uses euphony in the lines "And lucent syrops, tinct with cinnamon; Manna and dates, in argosy transferred" in his "The Eve of St. Agnes."