Diamond Jubilee Concert

Singer Robbie Williams performs at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012. The concert is part of four days of celebrations to mark the 60-year reign of Britain's Queen Elizabeth II.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

Britain's Queen Elizabeth II attends the Diamond Jubilee concert in London, June 4, 2012.

Complete Coverage: The Queen's Jubilee

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Will.i.am and Jessie J perform at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

The Duke and Duchess of Cambridge with Prince Harry, right, attend the Diamond Jubilee concert in London on June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: Dave Thompson

A view of the stage prior to the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

Singer Robbie Williams performs at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

Will.i.am of the Black Eyed Peas performs at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

Singer Robbie Williams performs at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

The Duke of Cambridge with Prince Harry, right, attend the Diamond Jubilee concert in London on June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: Dave Thompson

Grace Jones performs at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012. The concert is part of four days of celebrations to mark the 60-year reign of Britain's Queen Elizabeth II.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

Annie Lennox performs at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

Chinese pianist Lang Lang salutes the crowd after his performance during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: LEON NEAL

British composer Andrew Lloyd Webber plays the piano on stage during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: LEON NEAL

British singer-songwriter Robbie Williams performs on stage during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

Complete Coverage: The Queen's Jubilee

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British boy band JLS (from left, Aston Merrygold, Oritse Williams, Jonathan Benjamin "JB" Gill and Marvin Humes) performs during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

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British singer Cliff Richard, center, performs during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: LEON NEAL

Australian singer Kylie Minogue performs during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

Complete Coverage: The Queen's Jubilee

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Spectators with Union Flags crowd the Mall waiting for the start of the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

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Spectators watch the concert on giant creens on the Mall outside Buckingham Palace in London on June 4, 2012, during the Queen's Jubilee concert.

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In this photo released by MPL Communications, Sir Paul McCartney with Gary Barlow pose backstage at the Diamond Jubilee concert at Buckingham Palace in London on June 4, 2012. Complete Coverage: The Queen's Jubilee

Credit: AP Photo / MJ Kim, MPL Communications

A man wearing a fancy hat poses on the Mall in London, on June 4, 2012, in preparation for the Queen's Jubilee concert outside Buckingham Palace.

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A couple enjoy a special picnic in the grounds of Buckingham Palace during the Queen's Diamond Jubilee celebrations in London, on June 4, 2012. Complete Coverage: The Queen's Jubilee

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People stand outside Buckingham Palace ahead of the picnic and the Diamond Jubilee concert on June 4, 2012, in London.

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Two women with red wigs and Union Jack hats pose on the Mall in London, on June 4, 2012, in preparation for the Queen's Jubilee concert outside Buckingham Palace.

Complete Coverage: The Queen's Jubilee

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People dance and cheer in Hyde Park during a live retransmission of the Diamond Jubilee concert at Buckingham Palace in London on June 4, 2012.

Complete Coverage: The Queen's Jubilee

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Sir Andrew Lloyd Webber and Gary Barlow onstage at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012. The concert is a part of four days of celebrations to mark the 60-year reign of Britain's Queen Elizabeth II.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

Sir Elton John performs at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012. The concert is part of four days of celebrations to mark the 60-year reign of Britain's Queen Elizabeth II.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

Elton John performs at the Queen's Jubilee Concert in front of Buckingham Palace, London,, June 4, 2012.

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Credit: AP Photo / David Parker, pool

British tenor singer Alfie Boe performs during the Queen's Diamond Jubilee Concert at Buckingham Palace in London, on June 4, 2012.

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British musician Jools Holland during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

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British singer Tom Jones performs during the Queen's Diamond Jubilee Concert at Buckingham Palace in London, on June 4, 2012.

Complete Coverage: The Queen's Jubilee

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British comedian Jimmy Kaa performs on stage during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

Complete Coverage: The Queen's Jubilee

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British singer Shirley Bassey performs during the Queen's Diamond Jubilee Concert at Buckingham Palace in London on June 4, 2012.

Complete Coverage: The Queen's Jubilee

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Sir Paul McCartney performs at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012. The concert is part of four days of celebrations to mark the 60-year reign of Britain's Queen Elizabeth II.

Complete Coverage: The Queen's Jubilee

Credit: (AP Photo/Joel Ryan

Will.i.am and Stevie Wonder perform at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: (AP Photo/Joel Ryan

Rolf Harris performs at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan

Sir Paul McCartney performs at the Queen's Jubilee Concert in front of Buckingham Palace, London, June 4, 2012.

Complete Coverage: The Queen's Jubilee

Credit: AP Photo/Joel Ryan