Metallica/Slayer/Megadeth/Anthrax: The Big 4: Live from Sofia, Bulgaria (2010) (movie): In 2010, for the first time ever, four giants of metal shared one stage for seven European shows. "Big Four," Metallica, Slayer, Megadeth and Anthrax, the final night, at the Sonisphere Festival in Sofia, Bulgaria, was broadcast l... Discover the latest Discussions, Reviews, Quotes, Theories, Explanations and Analysis of Metallica/Slayer/Megadeth/Anthrax: The Big 4: Live from Sofia, Bulgaria (2010) below