Sonisphere 2011: More acts added to festival line-up

You Me At Six and All Time Low are among the latest acts to be announced to appear at this summer's Sonisphere festival.

Also confirmed to play at Knebworth Park between between July 8th and 10th are Sum 41, House Of Pain, Arch Enemy, Periphery, Grinspoon and Fozzy.

As previously announced, Metallica will close the Friday night of this year's event, Biffy Clyro will close the Saturday night and Slipknot will headline the Sunday night.

Sonisphere tickets are available to buy online now.

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