For few weeks now I hear voices coming from my electronic devices when I play audio (not really in the mood for schizophrenia jokes). There are some teenagers(judging by their voices) probably in one of the near apartment buildings with whom we share a wall. The voices are very clear and sometimes overpower the audio of the device that I'm using (laptop, mp3 player, phone, even a cassette player). Sometimes when I'm walking near my apartment building and listening to music I can hear them loud and clear, which means that it can cover a big ratio. What kind of a device can do that? How can I stop it interfering with my devices?