 Taken into the "corps" of the Royal Ballet in 1958, Mason was, at 16, the company's youngest member.She soon caught the eye of choreographer Kenneth MacMillan, who had been commissioned to create yet another dance version of "The Rite of Spring", set to Igor Stravinsky's score that had caused such a ruckus at its premiere with Diaghilev's Ballets Russes in 1913.Impressed by her talent and energy, and conscious, no doubt, of her youth and innocence, he cast her as the Chosen Maiden, around whom the rite evolves.