She is considered by many to be the reigning ballerina dancing today and he is equally stellar. Established stars in Russia, they left to guest with American Ballet Theater and others, mostly in the classical ballet. Originally scheduled for January with a classical emphasis, in the interim the program took on a more contemporary mode with works by big-name modern choreographers Sidi Larbi Cherkaoui, Ohad Naharin and Arthur Pita. On a prior visit, Osipova and Vasiliev were ferocious in a contemporary pas de deux. They don't just do tutus.