Set to a specially commissioned score by Matthew Pierce, Stanton Welch’s vibrantly theatrical Pecos Bill dramatizes the poignant romance between the legendary Texas hero Pecos Bill and the gutsy tomboy Sluefoot Sue. Modern dance legend Mark Morris’s Sandpaper Ballet contains the hallmarks of his work: wit, humor, and dazzlingly inventive movement, along with whimsical green and white costumes by noted fashion designer Isaac Mizrahi.