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Mike Portnoy, of Dream Theater, David Ellefson, of Megadeth, Steve Souza, of Exodus, Mark Osegueda, of Death Angel, Andreas Kisser, of Sepultura, Alex Skolnick, of Testament, Chuck Billy, of Testament,  and Chris Broderick, of Megadeth 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)