Britain's Queen Elizabeth II, 2nd from left, is joined on stage by performers Sir Tom Jones, Annie Lennox, Sir Paul McCartney and Sir Elton John at the conclusion of the Queen's Jubilee Concert in front of Buckingham Palace, London, Monday, June 4, 2012. The concert is a part of four days of celebrations to mark the queen's 60-year reign. (AP Photo/Joel Ryan)

Photo by: Joel Ryan

Britain's Queen Elizabeth II, 2nd from left, is joined on stage by performers Sir Tom Jones, Annie Lennox, Sir Paul McCartney and Sir Elton John at the conclusion of the Queen's Jubilee Concert in front of Buckingham Palace, London, Monday, June 4, 2012. The concert is a part of four days of celebrations to mark the queen's 60-year reign. (AP Photo/Joel Ryan)