In 1932 George Balanchine happened upon a ballet protégée, Irina Baronova, when she was a 12-year-old pupil of Olga Preobrajenska, the Russian ballerina teaching in exile in Paris. The visionary choreographer, who throughout his career would repeatedly mentor and package outstanding female dance talent, bundled Baronova with two equally precocious ballet cohorts, Tamara Toumanova (12) ...