The Collaborative International Dictionary of English v.0.48:

Euphony \Eu"pho*ny\, n.; pl. Euphonies. [L. euphonia, Gr. ?,
   fr. ? sweet-voiced; e'y^ well + ? sound, voice; akin to ? to
   speak: cf. F. euphonie.]
   A pleasing or sweet sound; an easy, smooth enunciation of
   sounds; a pronunciation of letters and syllables which is
   pleasing to the ear.
   [1913 Webster]

WordNet (r) 3.0 (2006):

euphony
    n 1: any agreeable (pleasing and harmonious) sounds; "he fell
         asleep to the music of the wind chimes" [syn: music,
         euphony]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "euphony":
   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