Ballet dancers perform on stage during the opening ceremony of the International Olympic Committee session in central London's Royal Opera House, July 23, 2012. AP

Opera singer Placido Domingo performs on stage during the opening ceremony of the International Olympic Committee session in central London's Royal Opera House. AP

Ballet dancers perform on stage during the opening ceremony of the International Olympic Committee session in central London's Royal Opera House. AP

Singers Duncan Rock, left, and Paloma Faith perform on stage during the opening ceremony of the International Olympic Committee session in central London's Royal Opera House. AP

Children perform on stage during the opening ceremony of the International Olympic Committee session in central London's Royal Opera House. AP

Opera singer Renee Fleming performs on stage during the opening ceremony of the International Olympic Committee session in central London's Royal Opera House. AP

London mayor Boris Johnson, recites a Pindaric Ode for the 2012 Olympic Games during the Opening Ceremony of the International Olympic Committee session in central London's Royal Opera House. AP

International Olympic Comittee (IOC) President Jacques Rogge, center left, arrives with Princess Anne to a ceremony to mark the opening ceremony of the IOC Session at the Royal Opera House. AP