By Elani Temperance
[Snip] The Muses (Μοῦσαι) are either three or nine in number, depending on the source. Plutarch, in his Quaestiones Conviviviales, named three Muses; Melete (Practice), Mneme (Memory), and Aoede (Song), but Hesiod described nine of them in his Theogony; Calliope (epic poetry), Clio (history), Euterpe (flutes and lyric poetry), Thaleia/Thalia (comedy and pastoral poetry), Melpomene (tragedy), Terpsikhore (dance), Erato (love poetry), Polyhymnia/Polymnia (sacred poetry) and Urania (astronomy). Due to the influence of Hesiod, Hómēros and others of their time, it’s the nine Muses we now go with.
These nine muses were born from Zeus and his aunt and fifth wife, Mnemosyne, who was the personification of memory. The Muses, back then, were simply Deities, in charge of Their own aspects of mortal life. Euterpe was the ‘Giver of light’, for example. Their function and status as Muses was a later, Roman, addition.