In one myth, the Muses judged a contest between Apollo and Marsyas. They also gathered the pieces of the dead body of Orpheus, son of Calliope, and buried them. In a later myth, Thamyris challenged them to a singing contest. They won and punished Thamyris by blinding him and robbing him of his singing ability.
Though the Muses, when taken together, form a complete picture of the subjects proper to poetic art, the association of specific Muses with specific art forms is a later innovation. The Muses were not assigned standardized divisions of poetry with which they are now identified until late Hellenistic times.
The Muses (Ancient Greek: Μοῦσαι, moũsai: perhaps from the o-grade of the Proto-Indo-European root *men- "think") in Greek mythology, poetry, and literature, are the goddesses of the inspiration of literature, science and the arts. They were considered the source of the knowledge, related orally for centuries in the ancient culture that was contained in poetic lyrics and myths.
In Boeotia, the homeland of Hesiod, a tradition persisted that the Muses had once been three in number. Diodorus Siculus, quotes Hesiod to the contrary, observing: Writers similarly disagree also concerning the number of the Muses; for some say that there are three, and others that there are nine, but the number nine has prevailed since it rests upon the authority of the most distinguished men, such as Homer and Hesiod and others like them.