The Big 4 Live from Sofia, Bulgaria features live concert performances by Metallica, Slayer, Megadeth and Anthrax, collectively known as "The Big Four" of thrash metal. The event took place on June 22, 2010 at the Sonisphere Festival at Vasil Levski National Stadium, Sofia, Bulgaria. Before its DVD release, it was shown at 450 movie theaters in the United States and over 350 movie theaters across Europe, Canada, and Latin America on June 22, 2010. The DVD peaked at number one on the United States, United Kingdom, Austrian, and Canadian charts, and also charted on three other charts. It was certified gold in Germany, and provided Slayer with its first platinum certification.