Drawing on highlights from his previous films on Markova, Vyroubova and Verdy, France’s leading chronicler of the process of ballet coaching adds significant new footage of former Paris Opera etoile Ghislaine Thesmar, another Balanchine muse. Setting Palais de Cristal on two of the company’s dancers, she sheds fresh light on the French/American symbiosis that marked Balanchine’s career. A not-to-be-missed opportunity for students of his choreography.