Classical Music
It turns out that the long-held belief that classical music increases children's intelligence is untrue. Businesses and other institutions are still perfectly justified in playing older music to children. It's true that it's a very pessimistic one.
A station run by Transport for London started playing classical music as an experiment in 2003 because of the high rate of petty crime there. Robberies decreased by 33% and vandalism by 37%. Businesses in the UK and the US copied it, including a McDonald's on the Isle of Wight in 2019. Its success was attributed to the loudspeakers' use of Bach and Vivaldi, which gave the places a stuffy, old-fashioned appearance.
This forces the young people to flee the neighborhood because it makes people feel "uncool." Obviously, this is being advocated more as a corporate strategy than as a government initiative since, despite what the senior folks may think, it's usually not good for cities and towns to push all the youth out.