Decibel Magazine have announced the details for their Decibel Metal & Beer Fest. The event will take place at The Fillmore in Philadelphia, PA on April 22-23, and it will include: Agoraphobic Nosebleed, Municipal Waste, Immolation, Krieg, Sleep, Pig Destroyer, Withered, Khemmis, Panopticon, Crypt Sermon, Fall Of Rauros, and Cemetery Piss. Decibel have also recruited…