Auditory expectation vs Auditory hallucination.

It’s amazing how much the mind works based on expectation.. having been listening to music most of the day today, the moment i take a break, come back and put on the headphones my brain simulates/hallucinates/whatever term the music… In reality the player was paused so there was no music being played. Ofcourse this happened only for a couple 100 milliseconds(just to be clear am not suffering from schizophrenia)