. . . . . "A charity single to raise money for Hillsborough families will feature stars such as Robbie Williams, Beverley Knight and Mel C and will go head to head with 'The X Factor' for Christmas number one.A range of artists including Rebecca Ferguson, Paloma Faith, Oasis drummer Chris Sharrock and The Clash's Mick Jones are joining together to perform a new version of The Hollies' hit, 'He Ain't Heavy, H" .