But that is exactly what happened in the early hours of Thursday when the rockers performed on stage with Barlow, and later with U2's lead singer Bono and U.S. band The Killers at a charity show following the BRIT pop awards.

The event was in support of the War Child charity, which aims to protect children living in the world's most dangerous war zones. It has just released a compilation album "Heroes." - more on this story

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