The hum in C is speaking to me tonight

There's a 60-cycle hum in the panel at the old flour mill that's been my company for the last three nights. It's not just noise anymore—it's got a voice, a low C that rises when I'm close to a loose connection. I know it sounds daft, but I'm starting to think the wires talk to you if you listen long enough. Maybe that's just the quiet and the rain and the hour talking. Either way, I'm not sure I want to fix it just yet.