© Istockphoto| Harbin Grand Theater, Harbin, Cina

© Istockphoto|Walt Disney Concert Hall, Los Angeles 

© Istockphoto|Palacio de Bellas Artes, Città del Messico

© Istockphoto|  Sydney Opera House, Sydney  

© Istockphoto|Teatro dell'Opera di Copenaghen

© Istockphoto|Palau de les Arts Reina Sofía, Valencia

© Istockphoto|Oslo Opera House, Oslo

© Istockphoto| Teatro dell'Opera di Guangzhou, Cina

© Istockphoto|Metropolitan Opera House, New York

© Istockphoto|Esplanade Theatre, Singapore