Recently, he's been posting clips of Gelsey Kirkland rehearsing Don Quixote, most likely taken a couple years after she joined American Ballet Theatre. You can watch her breaking down each step, working with her ballet coach David Howard as well as a flamenco coach, and giving herself notes by speaking directly to the camera.
Froman says the full footage is about an hour long (he acquired it a couple decades ago when he was still dancing for New York City Ballet). "When watching the entire disc, what becomes obvious is the inexhaustible, obsessive detail work," he wrote me in an email. "She sets the bar extremely high and I'm not sure she was ever equaled. All that Balanchine technique is still alive in her body, and she's very good to bring all the flamenco influences into her interpretation."