Green Day is going digital. Harmonix is releasing a version of the Rock Band virtual guitar-playing video game next year featuring the band's music. Some songs from the band's latest album, 21st Century Breakdown, were playable on Rock Band as add-on songs, but frontman Billy Joe Armstrong tells MTV he's now "excited to now be working on a game spanning our entire career. "We want people to fire this up, choose their favorite tracks and feel what it's like to perform on stage as Green Day."