The Muse

"Muse" means the one who remembers. The nine Muses are the daughters of the titan Mnemosyne, who is the personification of remembrance. All nine have a science or an art to protect:

1. Cleo protects the stories of heroes
2. Urania astronomy
3. Calliope elegies
4. Melpomene the tragedies
5. Euterpe flute playing
6. Erato love poems
7. Tepsicore choir lyrics
8. Thalia the comedies
9. Polyhymnia dance and music.

See Bullfinch's The Age of Fable