System of a Down Joins Ozzfest

The first show will take place on July 1, then the rock show will travel to 20 other cities.

In addition to the big bands, a second stage will present some up-and-coming, yet less known acts, such as Black Label Society, Atreyu, Unearth, Bleeding Through, Norma Jean, A Life Once Lost, Strapping Young Lad, the Red Chord, Full Blown Chaos, All That Remains and Between the Buried and Me.

Ozzfest will also mark the return of a solo Ozzy Osbourne after a three year break.  For the past two years, Osbourne has been touring with Black Sabbath.

Since it began in 1996, Ozzfest has had nearly 4.7 million in audiences.