Are you hearing voices? Don’t worry, that may just be “linguistic pareidolia.”
“Linguistic pareidolia” isn’t an actual term, but pareidolia describes seeing something that’s not there–like a face in the woodwork. The brain hears things that aren’t there, too. By connecting the dots between other sounds and what is already stored in your memory, you can hear voices that aren’t there. Take a look at this fascinating youtube video where I’ll bet you hear voices singing along.