Expression.

Expression belongs as distinctly to musical art-terminology as form to that of the older arts of painting and modeling. It applies as definitely to the technic of rendering as form can be said to apply to the technic of modeling. Expression bears exactly the same relation to emotion or feeling as the work of the sculptor, in its perfect or finished condition, bears to the warmth or enthusiasm with which it was conceived and executed. The listener hears and is moved by the artistic effect of the singer’s expression precisely as the beholder sees and is moved by the artistic effect of the sculptor’s creation.