DVD The Big Four: Live from Sofia Bulgaria Metallica Slayer Megadeth and Anthrax

The Big Four: Live from Sofia, Bulgaria is a live video with performances by Metallica, Slayer, Megadeth, and Anthrax, the "big four" of American thrash metal.[1] The concert took place on June 22, 2010, at the Sonisphere Festival at Vasil Levski National Stadium, Sofia, Bulgaria.