In 2005, the London metro system started playing orchestral soundtracks in 65 tube stations as part of a scheme to deter “anti-social” behavior, after the surprising success of a 2003 pilot program. The pilot’s remarkable results — seeing train robberies fall 33 percent, verbal assaults on staff drop 25 percent, and vandalism decrease 37 percent after just 18 months of classical music — caught the eye of the global law-enforcement community. Thus, an international phenomenon was born. Since then, weaponized classical music has spread throughout England and the world.