Opera director Mary Zimmerman and her creative team were recently booed by a Met audience for their new production of Bellini’s La Somnambula. The Wall Street Journal’s Terry Teachout provides an audio recording of the curtain calls, and muses on why boos are rare in New York, while common in Italy and sometimes elsewhere (google “Roberto Alagna La Scala,” or “Chereau ring brawl” for some celebrated examples).