4,791 views
German power metal band Blind Guardian performing live "The Bard's Song" live during Wacken Open Air festival in Wacken, Germany, August 2011
Wacken Open Air (W.O.A) is one of the biggest summer open air heavy metal music festivals.
Usually it is held at the beginning of August and lasts three days. In 2012 137 bands performed on seven stages.
