A voice absolutely perfect in its production awakens a peculiar set of sympathetic sensations. In addition to its musical beauty such a voice satisfies an instinctive demand for the perfect vocal action. An indescribable sensation of physical satisfaction is experienced in listening to a perfectly managed voice.
Taylor, David Clark. The Psychology of Singing: A Rational Method of Voice Culture Based on a Scientific Analysis of All Systems, Ancient and Modern. Macmillan, 1917.