Johann Strauss’s Die Fledermaus (but if it’s given in English, why not The Bat? Does that somehow sound too unglamorous?) is not only the greatest operetta ever composed, as everyone agrees, but also, in my view, a great work, to be ranked with the finest comedies in any genre. That is, beneath its featherbrained hedonism there is a core of seriousness, conveyed as usual by Strauss in glittering music that never lets you forget that all good things come to an end, usually sooner than you expect.