Well this is interesting as fuck. Seems right up your alley @little_tommy. #radio
I've heard this actually, years ago. I'll have to see if I can find it again. If I can't get it here I'll try the SDR setups online.
I can hear it on this: http://websdr.ewi.utwente.nl:8901/
Set the frequency to 4625 Khz and get buzzed.
Mostly an instance for friends and family. Nothing special.