Removing the musician’s eyes from the process of making music can produce truly astonishing results. You can use a blindfold, turn off the lights, play by candlelight, or ask everyone to close their eyes. Whichever method you use, you will hear a dramatic increase in the group’s musicianship almost immediately. Members of the ensemble will listen more carefully and be more aware of how they use their bodies to produce sound.
Learning by ear, rather than by eye, utilizes the brain in a completely different manner: one that is more consistent with the mental hierarchy we need to be truly great musicians.
–Julie Lyonn Lieberman, The Creative Band & Orchestra