That's true but they are listening for the notes, not the sound. Its an entirely different portion of the brain that is used. Try sitting in front of a keyboard and see if you can work out the notes of a favorite melody and you will see what I mean.
If you want a recording of a piano in the home to sound as real as an actual piano in the home, you have a real challenge. The problem is that the sound of the piano exists in the room- if you try to record and play back in the same room, you will have double the room signature. It won't sound right. That's why I stress that understanding the model of stereo is the first step to appreciating how real it can really sound, because if it really is sounding real, it will sound like the musical event, spliced on to the end of your room.
If you want a recording of a piano in the home to sound as real as an actual piano in the home, you have a real challenge. The problem is that the sound of the piano exists in the room- if you try to record and play back in the same room, you will have double the room signature. It won't sound right. That's why I stress that understanding the model of stereo is the first step to appreciating how real it can really sound, because if it really is sounding real, it will sound like the musical event, spliced on to the end of your room.