The MetaFilter discussion of this issue had an interesting tangent about a legendary Hungarian song which was allegedly suppressed after it triggered an epidemic of suicides:
"Gloomy Sunday", a Hungarian song for the violin, was believed to propel the despondent into suicide. Ironically, the title "Gloomy Sunday" has been used over and over since, for different songs unrelated to the original, which makes trying to find it even more difficult.
Snopes has this to say about Gloomy Sunday; apparently it did exist, though the suppression of it was an urban legend. And here's another story which ties it to a Nazi SS officer's suicide during the Holocaust.
I wonder whether the music for Gloomy Sunday exists anywhere; and, if so, how long until some post-rock band or other does a cover of it.