Question: The Clans Are Still Marching is a live DVD released by German heavy metal band Grave Digger on 7 March 2011 via Napalm Records, it was filmed live at the world-famous summer open-air heavy metal music festival, it takes place annually in the village of Wacken in Schleswig-Holstein?
Sentence (from "Wacken Open Air"): Wacken Open Air (W:O:A) is a summer open-air heavy metal music festival.
Relevant evidence: Yes