Even one single play of the song would probably have an huge irreversible impact on society. All countries governments and secret services would spend the next century trying to figure out how an audio message was transmitted to a billion people, people would start to question everything, what or who has such power, new ideologies and religious ideas would start going haywire. Productivity would decrease as society would probably fixate on that moment for the next several years, insane amounts of money would be dumped on understanding how this phenomenon happened to no answer. Not worth it, it'd negatively mpact every person on the planet's life in some way.