The nine sister goddesses, also known as the MUSES, were the daughters of Zeus and Mnemosyne in Greek mythology. They were the goddesses of the arts and sciences, and each was associated with a different field. The MUSES were Clio (history), Euterpe (music), Thalia (comedy), Melpomene (tragedy), Terpsichore (dance), Erato (lyric poetry), Polyhymnia (sacred poetry), Urania (astronomy), and Calliope (epic poetry). They were often depicted as inspiring artists and poets, and were believed to have been the source of creativity and knowledge.