Avenged Sevenfold, Machine Head and more join Sonisphere line up

Avenged Sevenfold, Machine Head, Alice in Chains, Thin Lizzy and The Sword have been added to the line up at this years the UK leg Sonisphere festival at Knebworth on August 1 and 2.

Organisers have stated, 'The first nine bands are in place, further announcements in the coming weeks will include some VERY special guests.'