The Dying Swan was a ballet.
During a talent night aboard the USS Voyager in 2373, Captain Kathryn Janeway performed The Dying Swan. She learned the dance when she was six years old. (VOY: "Coda")
The Dying Swan is a ballet danced to the music of the cello solo Le Cygne (The Swan) from Le Carnaval des Animaux (The Carnival of the Animals) composed by Camille Saint-Saëns.