Green Day just released the pop-punk band's first new music (not counting a Christmas single) since 2012, NME reports. According to Rolling Stone, new song "Bang Bang" is a "grim, high-speed dive into the mind of a potential mass shooter." "To get into the brain of someone like that was freaky," frontman Billie Joe Armstrong says. "After I wrote it, all I wanted to do was get that out of my brain because it just freaked me out." Revolution Radio, Green Day's 12th studio album and first since being inducted into the Rock and Roll Hall of Fame, is scheduled to be released in October. (More Green Day stories.)