Motorhead, Mastodon, In Flames & Parkway Drive Added to UK Sonisphere Festival

Motorhead, Mastodon, In Flames & Parkway Drive have been added to the line-up to this summer's Sonisphere UK festival.

Metallica, Slayer, Anthrax, Megadeath, Biffy Clyro and Slipknot were all previously announced for the three day festival.

Sonisphere UK takes places at Knebworth House from July 8th to 10th.