The commission from the Library of Congress and underwritten by Mrs. Elizabeth Sprague Coolidge paid him $1,000 for the piece, which was required to use only six dancers, require a small orchestra, and last no more than half an hour, but allowed him free choice of subject. Stravinsky had been thinking of writing a ballet on an episode in Greek mythology for some time and decided to make Apollo, leader of the muses, its central figure while reducing the number of muses from nine to three. They were Terpsichore, personifying the rhythm of poetry and the eloquence of gesture as embodied in the dance; Calliope, combining poetry and rhythm; and Polyhymnia, representing mime. Stravinsky explained the original title "Apollon Musagète" to mean "Apollo, Leader of the Muses".