TWO further bands have been added to the bill for the Sonisphere music festival, which will take place at Knebworth this summer. American heavy metal rockers

TWO further bands have been added to the bill for the Sonisphere music festival, which will take place at Knebworth this summer.

American heavy metal rockers Lamb of God and Mastodon will join headline acts Metallica and Linkin Park at the two-day festival, which will be held in the grounds of the stately home over the weekend of August 1-2.

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