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Chuck Billy, of Testament, David Ellefson, of Megadeth,  Steve Souza, of Exodus, Andreas Kisser, of Sepultura,  Mark Osegueda, of Death Angel, and Gary Holt, of Exodus perform on stage during the Metal Allegiance concert at the House of Blues on Wednesday, January 21, 2015, in Anaheim, Calif. (Photo by Paul A. Hebert/Press Line Photos)