In New York, the idea of the Rockettes dancing to fake music hurts your teeth. But in Chicago? “Here in the Midwest, the leggy chorus line always has danced to a computer. The music was fake when this show first came to the Rosemont Theatre. Now it’s back after a couple of years. And whadaya know, the music is fake again. The lack of live musicians in a colossal attraction that surely could afford them is an irritation because there’s otherwise a lot to recommend this show as a holiday amusement.”