THE HUMAN VOICE VIBRATES NATURALLY – BUT IN SUCH A WAY – THAT IT ALL SOUNDS BEAUTIFUL – IT IS THE NATURE OF THE VOICE. WE IMITATE SUCH EFFECTS NOT ONLY ON WIND INSTRUMENTS, BUT ALSO ON VIOLINS – EVEN ON THE KEYBOARD – BUT AS SOON AS WE CROSS NATURAL BOUNDARIES, THE SOUND IS NO LONGER BEAUTIFUL – BECAUSE IT IS CONTRARY TO NATURE.