While the guide explained the history and design of the three-tiered Opera House, he had us sit in the plush chairs in the orchestra section. The theater's acoustics are considered to be among the best in the world. There was a crew on the stage, busily changing the set and providing a serendipitous visual accompaniment to the guide's speech. Afterwards, we sat on the marble steps in the foyer and listened to an abbreviated recital. A shaven-headed baritone, clad in a black and gold uniform, performed two comic arias from Don Juan. As he sang, he brandished a book of photographs of hundreds of women. They were meant to represent Don Juan's amorous conquests. He had a superlative voice, as one would expect, nay, demand in such a setting.