The band was formed in 1999 in California, and for many years the responsible for the drum machine was The Rev.
The year was 2009, and James "The Rev" Sullivan was found dead in his appartment, purportedly by nature causes, but several toxic substances were found in his body.
After this unliked event, Mike Portnoy took the Avenged Sevenfold's drumsticks and played in the band for one year. Mike Portnoy played in A7X only for a year because it was planned like that.
With the 2011 tour on the way, no one knew who were the next drummer of A7X. The name of Arin Ilejay didn't took a long time to came up and till the present date he his the currently drummer of Avenged Sevenfold, and he impressed not only the band, but he revive a bit of what the rev had done before.