Elton John sang "I'm Still Standing," Stevie Wonder crooned "Isn't She Lovely," and Paul McCartney sent "All My Loving" as musical royalty celebrated Queen Elizabeth II's 60-year reign with a concert outside Buckingham Palace on Monday. But the joy was tempered by news that the queen's husband, Prince Philip, had been hospitalized with a bladder infection.
Palace officials said the prince, who will turn 91 Saturday, was taken to the King Edward VII Hospital in London from Windsor Castle on Monday as a precaution and will remain under observation for a few days.
As the Diamond Jubilee show ended, Prince Charles took the stage and encouraged concertgoers to make some noise for his father. The crowd responded with a roar and chants of "Philip."
The heir to the throne paid tribute to his mother, addressing her as "Your Majesty -- Mummy" and leading the crowd in three cheers.
Despite Philip's illness, many members of the royal family, including Charles, his wife, Camilla, Duchess of Cornwall, and Princes William and Harry sat in a royal box to watch the show, performed on a specially erected stage outside the palace.
The queen was cheered as she arrived partway through the show, wearing a gold lame cocktail dress under a dark cape. It was decided before Philip's illness that she would watch only part of the concert.
The 86-year-old queen is not a noted pop music fan, and appeared to be wearing yellow ear plugs as she observed the concert.
Some 12,000 contest winners watched the show from an enclosed area, while a huge crowd stretched down the Mall, the wide boulevard leading up to the palace.
The lineup featured a full hand of knights -- McCartney, John, Cliff Richard and Tom Jones, all "Sirs" -- along with Dame Shirley Bassey and younger artists including JLS and Kylie Minogue.
The show opened in a blaze of sound and color, as a scarlet-clad military band joined Robbie Williams onstage for his hit "Let Me Entertain You." Black Eyed Peas star Will.i.am performed "I Gotta Feeling" with songstress Jessie J.
In true something-for-everyone mode, performances ranged from pianist Lang Lang playing Gershwin to American soprano Renee Fleming to Grace Jones, 64, hula-hooping her way through "Slave to the Rhythm."
Performers from around the world sang a special jubilee song written by Andrew Lloyd Webber and Gary Barlow.
It was the veteran entertainers who went down best. The crowd roared along to Cliff Richard's "Congratulations," and cheered Bassey singing -- fittingly -- "Diamonds are Forever." Prince Harry could be seen singing along -- "Why, why, why?" -- as Tom Jones belted out "Delilah," while Prince William and his wife, Catherine, joined in on John's "Crocodile Rock."
The queen may not like to rock 'n' roll but she has plenty of fans among rock's elite.
Before the show, Elton John paid tribute to the monarch's constancy.
"She's not trendy, she doesn't follow any fads," John told the BBC. "She's stoic, she's brilliant, she's wise, she's funny, and we're all really happy to be here."
McCartney closed the concert playing "Ob-La-Di, Ob-La-Da" on a Union Jack guitar before the queen took the stage with her family.