The Mars Volta have announced that their only UK show of 2011 will be at Sonisphere Festival. The festival takes place 8th - 10th July 2011 at Knebworth House. For tickets and more info head to www.sonispherefestivals.com. Line Up So Far THE BIG 4 - METALLICA, SLAYER, MEGADETH, ANTHRAX BIFFY CLYRO SLIPKNOT AIRBOURNE ALESTORM ALL TIME LOW ARCH ENEMY ARCHITECTS THE BLACK DAHLIA MURDER BLACK TIDE DIAMOND HEAD FIREWIND FOUR YEAR STRONG FOZZY GALLOWS GOJIRA GRINSPOON HOUSE OF PAIN IN FLAMES INME KIDS IN GLASS HOUSES KILLING JOKE LIMP BIZKIT THE MARS VOLTA MASTODON MOTÖRHEAD ONE MINUTE SILENCE OPETH PARKWAY DRIVE PERIPHERY PROTEST THE HERO RISE TO REMAIN SIX HOUR SUNDOWN SUM 41 THE SISTERS OF MERCY THE TREATMENT VOLBEAT WATAIN WEEZER YOU ME AT SIX