Erato, Euterpe, Polyhymnia, Terpischore, Thalia and Urania. Each Muse should embody their specific role (i.e. Thalia, Muse of Comedy should have a comedic knack). Although the roles are specified as sisters, it is completely fine to cast guys; the most important thing is that they work well as a synchronous group. These featured roles are perfect for experienced performers with strong voices and lots of creativity.