Metal at the movies: The Big Four with Metallica, Slayer, Megadeth & Anthrax (video and setlists included)

All photos from MetOnTour.com unless otherwise noted. Thousands packed stadiums across Eastern Europe as the fabled "Big Four" of American thrash metal — Metallica, Slayer, Megadeth, and Anthrax — shared a stage for the first time. International...