Euphony refers to pleasantness or melodiousness in language, achieved through harmonious sounds and smooth flow of words.
Cacophony is the opposite of euphony, referring to harsh or discordant sounds in language.
Alliteration is the repetition of initial consonant sounds in words close to each other, adding a musical quality to writing.
Assonance is the repetition of vowel sounds within words or phrases, creating a pleasant and melodic effect.