This scientific and behavioral investigation delves into the mechanisms of the "neuronal symphony", this chain reaction of stimuli triggered by music. When listening to it, neurons coordinate like the instrumentalists of a large orchestra: the more the brain synchronizes, the more it develops its skills. According to the neuroscientists and cognitive psychologists interviewed (including Professor Emmanuel Bigand), music can be recognized as a biological necessity, generating dopamine in the same way as food or sex, the two pillars of survival. In counterpoint, the film evokes the "amusiques", these people suffering from a deficit of perception and incapable of identifying a piece of music, such as Roosevelt or Nabokov. Che Gevara, for his part, could not recognize the Argentine anthem. Rebel to the end...