“Roberto Alagna and Jonas Kaufmann take turns playing Carmen’s desperate lover, Don José” may be a quote from the online brochure of the Opera House you started in one of your opera fanatic dreams. In real life, it is a quote from the Metropolitan Opera’s website. Jonas Kaufmann will be singing for the last two shows of the run early March while Roberto Alagna has covered the whole month of February. Any good vocal coach will tell you that French is the...