Crime at the city's Light Rail stops has been up, so Portland police piped in classical music.
The idea was that classical music has a calming effect.
Another benefit was that it reduced loitering among 18-to-25-year-olds. That age group tends to get into trouble.
The soothing sounds seem to be working. Since the program began, police calls at the test site have gone down by about 40 percent.
If the numbers continue to go down, classical music may soon be played at all of Portland's Light Rail stops.