Harmonix and MTV Games have announced that three exclusive tracks from multi-platinum, Grammy Award-winners Green Day, as well as eight songs from artists performing at the premiere of the RockStar Energy Drink Mayhem Festival, will be added to the Rock Band Music Store next week for the Xbox 360, PS3 and Wii.

The Green Day tracks available next week are the first in an exclusive partnership between MTV Games' Harmonix and Warner Music Group's Green Day to bring the band's songs to the Rock Band platform as downloadable content. These first songs, "21 Guns", "Know Your Enemy" and "East Jesus Nowhere," are from the band's latest album, 21st Century Breakdown.

Eight songs from artists performing at the RockStar Energy Drink Mayhem Festival, including Behemoth, Cannibal Corpse, Marilyn Manson and Slayer, will also be available for download next week in the Rock Band Music Store. The RockStar Energy Drink Mayhem Festival is a new summer touring metal and rock festival in the United States during July and August, assembled by Vans Warped Tour founder Kevin Lyman. Rock Band fans can also play tracks by RockStar Energy Drink Mayhem Festival performers Killswitch Engine and Bullet For My Valentine, previously released as downloadable content.