Those guys who call themselves The ERS or Partyharders (depending on the context) are simply responsible for putting Belgium and especially their city of Liège on the map for good.
These are videos from concerts where Partyharders played, so they may be of other bands that played the concert as well.
Lowlands Festival 2010 Aug 20 - 22, 2010 Biddinghuizen, Flevoland, Netherlands Added by Concert Archives