Topic summary
Euphony

Extracted from the Wikipedia article Phonaesthetics.
Euphony and cacophony
Euphony is the effect of sounds being perceived as pleasant, rhythmical, lyrical, or harmonious. Cacophony is the effect of sounds being perceived as harsh, unpleasant, chaotic, and often discordant; these sounds are perhaps meaningless and jumbled together. This is similar to consonance and dissonance in music, which are pleasant and unpleasant sounds respectively. In poetry, for example, euphony may be used deliberately to convey comfort, peace, or serenity, while cacophony may be used to convey discomfort, pain, or disorder. This is often furthered by the combined effect of the meaning beyond just the sounds themselves.