Three months before release: Affix blurry, incomprehensible band posters to bus shelter ceilings across the city. Some posters will feature a tiny QR code in one corner. When scanned by a smartphone, the code brings up a website containing three riddles about the band. Solve all three, and that night a brick is thrown through your bedroom window with a thumb-drive taped to it. That thumb drive contains the name of the new album’s super-secret hidden…