The Nine can refer also to the Nine Muses of Greek Myth: Calliope was the muse of epic poetry. Clio was the muse of history. Erato was the muse of love poetry. Euterpe was the muse of music. Melpomene was the muse of tragedy. Polyhymnia was the muse of sacred poetry. Terpsichore was the muse of dance. Thalia was the muse of comedy. Urania was the muse of astronomy