The first set of bands have been revealed for next year’s Wacken Open Air festival. The event will take place in Wacken, Germany on July 31 to August 3 and it will feature the following: Scorpions, Amon Amarth, In Extremo, Blind Guardian, Mayhem (40th anniversary set), Pain, Beast In Black, Watain (“Lawless Darkness” set), Bury…