The Sugababes were forced to perform an acapella gig after a soundsystem blew up at the venue.The group performed at the Grand Prix ball in London's Hurlington Club on Wednesday, and agreed to sing with no backing music after sound in the venue cut out halfway through the event, Metro reports.The band played several of their biggest hits, performing to guests including Nancy Dell'Olio, Beverley Knight and Frank Lampard's former partner Elen Rivas.An auction at the event raised £43,000 for the CLIC Sargent children's cancer charity.It was recently reported that the Sugababes are working on their eighth studio album.
