what was harris's fixed idea about himself ???? what did his friends think about the idea??(chapter8)

During their conversation, Harris mentions that he would sing a comic song while hunting the owners, so J. then digresses to explain how Harris believes himself a fine singer of comic songs, while he is actually quite terrible at it. He tells the reader of a party where Harris demanded he be allowed to sing, and then embarrassed himself and the piano players who tried to help him. Jerome relates part of this section in play-form.