A three pack of songs from Green Day will be added  on Dec. 15 (Dec. 17 on PSN). 

Green Day will bring three more tracks from 21st Century Breakdown to the Rock Band Music Store as downloadable content. The three pack of songs will include, "Christian’s Inferno," "Last of the American Girls," and "¡Viva La Gloria!". These tracks will be available for purchase as “Green Day Pack 02” as well as individual tracks on Xbox 360 and PlayStation 3 system, and as individual tracks on Wii. "Last of the American Girls" and "¡Viva La Gloria!" will also be available in the family-friendly LEGO Rock Band Music Store. 

$1.99 USD, £.99 UK, €1.49 EU (160 Microsoft Points for Xbox 360) per track

$5.49, £2.49 UK, €3.99 EU (440 Microsoft Points for Xbox 360) for “Green Day Pack 02”

$2.00 USD (200 Wii Points) per track