To those, like me, who know nothing about ballet, this is unexpectedly riveting stuff: the story of how the world's greatest ballet company carried on after the death of Serge Diaghilev in the 1920s, and how great performers, musicians, designers and choreographers took the message of ballet all around the world. Basically, the brand-name splintered: two opposing impresarios managed the Ballet Russe of Monte Carlo and the "original" Ballet Russe. One ran out of money; the other shrewdly hired American dancers and gained a foothold in Hollywood. Both companies found that they were inspiring other, competing outfits everywhere, which undermined their monopoly. This movie has wonderful, moving interviews with the elderly dancers now - sprightly in their 80s and 90s and still passionate about their art.