The Oxford Thesaurus An A-Z Dictionary of Synonyms - harmony n.

1) agreement, accord, concord, compatibility, rapport, unanimity, unity: The purpose is to promote harmony among the warring factions. 2) consonance, congruity, balance, orderliness, closeness, togetherness, consistency, fitness, parallelism: A sense of harmony can be felt among the European nations. 3) melodiousness, euphony, tunefulness: Their voices are in perfect harmony.