Far more to art exists than what you see as an audience member - when you watch a film, you do not know or care about the camera the cinematographer used, but it shapes what you experience. When you go to a live music show, you can't hear the cues and countdowns in the performer's ears that make sure everything happens in perfect time, but they are as essential to the performance as the lights that colour the stage. And yet it is a part of the art nonetheless - something does not have to be seen to have meaning or to be part of a performance.