"Big Four" - Metallica, Slayer, Megadeth and Anthrax - lands at the Empire Polo Club in Indio, Calif., in April.

The Only  U.S. appearance, hard rock's "Big Four" - Metallica, Slayer, Megadeth and Anthrax - lands at the Empire Polo Club in Indio, Calif., in April.

 Check out TheBig4Festival.com