There was a time when New York City was home to no fewer than three major ballet companies: New York City Ballet, American Ballet Theater and the Joffrey Ballet. But you could have been forgiven for thinking there was room for only one great ballet choreographer, George Balanchine. New York City Ballet had Balanchine, its founding choreographer, who so dominated the aesthetics of ballet in America that all others were measured against him, and usually found wanting. American Ballet Theater was the home of star dancers, often from abroad, like Mikhail Baryshnikov, Natalia Makarova and Julio Bocca. And then there was the Joffrey Ballet, which moved to Chicago in 1995.