This hobby is getting weird ....

When I listen to music now I hear voices telling me to complain about Audiogon's voting policy.................

I think your head is discharging the sound back to the headphones. Sometimes it takes the entire lenght of the CD to get rid of it.

Centurymantra, The source of the "voices" you were hearing was probably athe residue of a mastertape that was not "fresh". Very often master tapes are "erased" and then recorded over. When you crank it up a bit you can often hear the "residue" of the previously "erased"
recording. I used to have a small recording studio, and have heard exactly what you described countless times.
Hornby... it was probably RF interference. Happens all the time. I doubt there is anything spooky going on here.

RFI, Radio Frequency Interference. It happens on many things, telephones, your sound system. You must have a radio station close by.

In days of old before cable, and it can still happen rarely with cable, when someone with a CB drove by it would come thru on the TV. Cars also used to drive by and you could hear and see the interference from the vehicle ignition on the TV.

Ever had a remote control car act weird when no one has the remote. It's a CB radio.

You might try some ferrite beads on your power line. Maybe on any interconnects. You can get them at RS.