Summertime Ball: Robbie Williams, Justin Timberlake, Psy, review The Capital FM Summertime Ball is a strange affair: now in its fifth year, it involves 22 pop acts and 80,000 fans spending six hours together in Wembley Stadium. This year's bill was its biggest to date: Robbie Williams, country superstar Taylor Swift and Will.i.am were the highlights; Justin Timberlake was the host. Despite the starriness of the line-up, most of the audience, whose average age was 12, had turned out in tribal support for one or more of the evening's interchangeable pop acts, such as The Wanted, Union J, Lawson, Loveable Rogues and Olly Murs. When Robbie Williams finally immerged for his 10pm headlining slot - greying and self-confessedly "a little tubby" but otherwise in sprightly form - most of the teenyboppers had already gone home. This was a shame, as it only took the opening chord of Let Me Entertain You for the 39 year-old to display more showmanship than all the preceding acts had managed put together. A set of Williams's crowd-pleasers followed: Rock DJ, Candy and, to finish, Angels, complete with the swagger and lip-curl that will be familiar to all fans of Take That. Williams even sent up his own recent chart flop, Be A Boy: "Here's a song which didn't break the Top 100!" There were several surprises - Wanted heartthrob Nathan, who has been out of action after throat surgery, literally sprung out of the stage to perform an impressive a capella solo - but the best was an acoustic set from Timberlake himself. As compere, Timberlake bantered rather awkwardly with the crowd, often adopting a hammy British accent. His singing was a clear improvement on this, thanks to slow, almost teasing renditions of Cry Me a River, What Goes Around and covers of Bill Withers's Ain't No Sunshine and Heartbreak Hotel. Timberlake's guitar provided the most purely musical moment of the night. The majority of contemporary pop, at least according to Capital FM, appears to involve cheesy, pounding electronic beats borrowed from dance music. On that theme, a final mention should go to Korean YouTube sensation PSY, who persuaded 80,000 people to perform his globe-conquering Gangnam Style. PSY was inspired to become a pop star after watching Queen's 1986 Wembley gig on television. Dancing his signature routine alone above the pulsating crowd was, he said, a dream come true. It was a rare heartwarming moment in an afternoon of artificiality.