You could be rocking out to the Big 4 - Metallica, Megadeth, Slayer and Anthrax - plus loads more this July??_ The Sonisphere festival hits Knebworth on 8th-10th July, and this year boasts a stellar line-up of rock royalty. MTV UK is offering two lucky winners the chance to each win a pair of VIP tickets to Sonisphere 2011, which also includes VIP camping and VIP bar access. Competition closes Wednesday, May 18. Enter
