A new Stephen Sondheim musical (his first in nine years) is preparing for Broadway, and producers are studying the audiences. “The conventional wisdom is that you are better off listening to the audience as a group than to any one individual member of it. As far as critics’ responses, because each review reflects the opinion of just one person, the show’s collaborators tend to discount them. In the case of Bounce, most notices have sounded disappointed. It’s not that critics dislike the musical; it’s more that they think it’s a minor work. Some, though, have added that even below-average Sondheim is better than almost everything else.”