Possible Clues:

• All in gambles and all for show
• Pavlova performances
• "Rodeo" and "Swan Lake," e.g
• Performances
• Works that may require leaps of imagination?
• Swan Lake and Giselle
• 'Swan Lake' and others
• 'Swan Lake' and 'Rodeo'
• Some dances
• They keep performers on their toes