The power of music, narrative and drama is of the greatest practical and theoretical importance. ... We see how the retarded, unable to perform fairly simple tasks involving perhaps four or five movements or procedures in sequence, can do these perfectly if they work to music.
Oliver SacksIt seems that the brain always has to be active, and if the auditory parts of the brain are not getting sufficient input, then they may start to create hallucinatory sounds on their own. Although it is curious that they do not usually create noises or voices; they create music.
Oliver Sacks