(n.) A pleasing or sweet sound; an easy, smooth enunciation of sounds\; a pronunciation of letters and syllables which is pleasing to the ear.

accord accordance attune attunement balance beauty chime chiming concentus concert concinnity concord concordance consonance consonancy consort diapason equilibrium harmonics harmony heavy harmony homophony measure measuredness monochord monody order orderedness proportion rhythm sweetness symmetry symphony synchronism synchronization three-part harmony tune unison unisonance