Tiler Peck in George Balanchine’s “Who Cares?” NYCB. Photograph by Paul Kolnik. Tiler Peck recently has become the company’s most thrilling and musical ballerina. In Who Cares? (1970), danced to George Gershwin tunes, she proved what it means to dance big, projecting grace — and even sensuality — in her pas de deux with Robert Fairchild. The audience immediately perked up whenever she appeared onstage.