"The Mousai . . . daughters of Mnemosyne and Zeus . . . sweetly speaking Nine . . . Kleio, and Erato who charms the sight, with thee, Euterpe, ministering delight : Thalia flourishing, Polymnia famed, Melpomene from skill in music named : Terpsikhore, Ourania heavenly bright."

Source: https://www.theoi.com/Ouranios/Mousai.html