Ever heard someone say, "She's my muse"? These are the ladies behind that saying. The Muses were the inspirational goddesses of the arts, who spent most of their time singing about all the great events of the world in the court of Zeus. In super ancient times, there were only three Muses, but in later years their number was expanded to nine, and each inspirational lady was assigned their own name and duty. Ready for 'em? Here we go: Calliope (epic poetry), Clio (history), Erato (love and erotic poetry), Euterpe (lyric poetry), Melopmene (tragedy), Thalia (comedy), Polyhymnia (hymns), Terpsichore (dance), and Urania (astronomy). Whew.