Diamond Head & The Big Four at Sonisphere We have just got back from two phenomenal shows at the Knebworth Festivals. We would like to thank everybody for your support at these exceptional events, and the incredible reception from the crowds both at Knebworth and Amneville. On both occasions Brian joined the Big Four for 'Am I Evil?' at Knebworth and 'Helpless' at Amneville. More reviews, photos and video to follow soon... For a taste, see some of the following reviews; Sonisphere site review or Lick Library - review . or Rock Sound - review .