Paris Opéra - 33-8/36-69-78-68.
Metropolitan Opera - 212/362-6000.
Sydney Opera House - 61-2/9319-1088, fax 61-2/9310-4917.
War Memorial Opera House - 415/864-3330.
Bass Performance Hall - 817/212-4280.
Teatro alla Scala - 39-02/7200-3744.
The Bolshoi - 212/758-1162 0r 7-095/292-9986.
The Mariinsky Theater - 7-812/144-1211, fax 7-812/314-1744.
Vienna State Opera - 43-1/514-44-2653.
Teatro Massimo - 39-091/605-3315.
Tickets can be booked by calling or faxing the numbers at the end of each entry.