The Standard wrote: "LU used the music at Elm Park station, on the eastern end of the District line, where gangs were hanging around and assaulting staff and passengers. A spokeswoman said: "The theory behind it is that the youths were unfamiliar with this type of music and didn't like it. They certainly didn't like Mozart or anything by Pavarotti. The gangs just disappeared."
Goodness knows who came up with this theory on the Tube - it sounds like something out of Monty Python.
But I wonder if this work on other types of crime? Are people with classical music playing ringtones less likely to have their mobile phones nicked? Should your car alarm play Vivaldi?