Nursery rhymes set to music are deeply uncool. Just ask the bottle-throwing teenagers on the Twinbrook estate on outskirts of west Belfast. Ice cream music was played to them as they misbehaved and it stopped them.
The rest of the article talks about how they were trying to solve the issue with humor and not violence, and yet these police heroes instead got scolded by their command. Not only was this awesome, there are many other examples where a non-violent solution was effective.
Further down in the article is an example where a Los Angeles gang was removed from an area by renaming the street "Gay Street" and "Pansy Square". A commenter mentions that a New York bus terminal was cleaned up by playing classical music instead of rock. And of course there's the Arizona sheriff who found that making prisoners wear pink underwear made them less likely to fight each other.