Comment: Cornelius hears an improvement in the sound of a high note when the singer makes a diminuendo on it and immediately says, ""Let's investigate that."" It is then that he decides to swiftly change the exercises, obviously working on lightness and flexibility.
Quote: Functional listening, a capability which is refined through experience and training, is the ability to associate various tone qualities with the underlying mechanical processes which have produced them. ...Learning how to listen is indispensable to both teaching and technical training. (A Dictionary of Vocal Terminology)