The Pianist- Motion Picture. HELP someone whos familiar with clical music!?

In the scene where adrian brody is in the cafe in the ghetto and he is playing the piano does anyone know what that piece is. He plays it on two different occasions. Once, he is interupted by a man who asks him to stop to hear his money. Another time he is interupted by his sister. The scene comes right after the scene where adrian brody and his family watch as their neighbor is thrown from the window and the others are shot and ran over. please answer quickly