I started doing some recording for a youtube review of Chromixium and when I played back the file, I noticed something strange… The video contained audio from the ABC (Australian Broadcasting Corporation) radio station, even though the radio wasn’t on nor was a microphone plugged in. I guess I’ll have to put the sides back on my case before trying that again 
(I uploaded the recording of this strange occurrence if your curious).
Could be that certain components in you audio line just happen to make a nice filter for radio on that channel. I've heard - but never myself witnessed - similar things happening before.
Was an interesting read. I've heard channels bleed over on my CB, and AM/FM before never thought it could happen on a PC. AM/FM only happened for a few seconds and I noticed it was when a cop car would drive by my house.
You live next to the radio station? Not sure how many watts are pushed through for radio towers in Australia, but in the U.S. I think most use 50,000.
if you are near radio towers. your cables will absorb it.
all of the metal in your pc will act as a receiver and your speakers
can play it..
to solve this
on your audio cable, this is built in on some headphones cables.
but i find alot of other cables don't, generally you will not get this issue
any Ferrite-Core will do the job. the link above to help.
Thing is, I'm nowhere near a radio tower. I did turn the volume way up though (WAY up).
As far as I know, I live nowhere near a radio tower and I have no idea about radio tower wattages. Never really looked.