(Class. Myth.) One of the nine goddesses, daughters of Zeus and Mnemosyne, who presided over song and the different kinds of poetry, and also the arts and sciences; often used in the plural. At one time certain other goddesses were considered as muses. "Granville commands; your aid, O Muses, bring: What Muse for Granville can refuse to sing?" Note: The names of the Muses and the arts they presided over were: Calliope (Epic poetry), Clio (History), Erato (Lyric poetry), Euterpe (music), Melpomene (Tragedy), Polymnia or Polyhymnia (religious music), Terpsichore (dance), Thalia (comedy), and Urania (astronomy).