Stores that sell audio equipment many times have displays with mannequin heads in their window. The heads are wearing headphones with the overall effect being that of an intent listener. Thinking about that of course can make you wonder if anyone is really listening, listening to what's playing at the other end of the headphones or even perhaps to the people talking with them when they're not wearing headphones.
Thinking back I remembered a photo from awhile ago of another head, slightly different in that's it's clear. Not that we can see the music or the thoughts. We'll have to wait for the mannequin to speak.