If you are new to opera, this book is essential. The rough guide goes through the opera from Monteverdi to the 20th century and gives you the summeries, commentaries and recommendations of various works in a very informative manner. I particularly enjoyed the explanation for why each of the recordings was recommended, and I found the choices much more sensible than say, in the Penguin Opera Guide. There are some controversial choices (I doubt you will find any other book recommending Te Kanawa's Boheme recording), and mistakes (Callas never sang Simon Boccanegra), but this is expected from a book with such a wide compass. Even for those of us who have been listening to opera for quite some time, this book can bring something new. For example, if you have been enjoying Berg and Britten, but would like to know more about the pieces written after their works, you will find wonderful discussions about Menotti, Adams or Cage. Particularly well covered are the recent British composers. Highly recommended!