Completing what is surely going to be the biggest festival line up in Australia for 2013, the second artist announcement for Soundwave has dropped this afternoon, led by Slayer and surprisingly, Cypress Hill.

Over 20 new acts have been added to Soundwave's already impressive line-up which included Metallica, A Perfect Circle and The Offspring. Cypress Hill will be the first hip-hop act to co-headline the festival, while bands including Bullet For My Valentine and Bring Me The Horizon will be returning to the festival for their second appearances.

Check out the second line-up announcement below!

SLAYER
CYPRESS HILL
BULLET FOR MY VALENTINE
BRING ME THE HORIZON
BILLY TALENT
MINDLESS SELF INDULGENCE
THE BLACKOUT
FUCKED UP
GALLOWS
THIS IS HELL
AMITY AFFLICTION
CEREBRAL BALLZY
CROSSFAITH
POLAR BEAR CLUB
EARLY NOVEMBER
THE DEAR HUNTER
BLOOD ON THE DANCEFLOOR
VERSUS THE WORLD
SYLOSIS
CONFESSION