It symbolizes the mental instability.
Explanation:
Playing piano is said to get over some kind of anxiety, depression or any other kind of mental instability. Studies show that it is right.
A piano player symbolizes that he is a person who might be going through some kind of depression, anxiety and he is playing piano to get through that and over tat depression which is mental instability. Pacing the floor is a symbol that one is anxious ( anxiety ) of something that is going to happen or has just happened in a situation.
