Watch O Som, ou Tratado de Harmonia for Free: How to Stream the Movie Online at 123Movies. . film about the desire of listening. An intermingling of voices from childhood, dreams, history, sex and politics. A visual essay about the universe of sounds. What is sound? What is the sound experience? Sound placed and replaced as Energy. Nothing more should be said. The final conclusion, while the spectator flies over an infinite sea, talks about spreading fragility open. That is the Sound.