Daughters of Zeus and Mnemosyne, presided over the liberal arts particularly, were nine in number, and dwelt along with Apollo near Parnassus, Pieria, and Helicon; Clio presided over history, Euterpe over music, Thalia over comedy, Melpomene over tragedy, Terpsichore over choral dance and song, Erato over erotic poetry and elegy, Polyhymnia over lyric poetry, Urania over astronomy, and Calliope over eloquence and epic poetry.