Music with words (songs) apparently can help brain damaged stroke patience rewire their damaged brain. According to Dr. Aniruddh Patel of the San Diego Neurosciences Institiute, there is now an explosion of research on music and the brain over the last 10 years. It seemed music can engage huge areas of the brain, implying I suppose that music would have huge influence on the brain.
The results of one such research led by Gottfried Schlaug, Neurology Professor of the Beth Isreal Deaconess Medical Center and Boston Harvard Medical School was presented at the annual meeting of AAAS (American Association for the Advancement of Science). Professor Schlaug's study was the first to combine "Melodic Intonation Therapy"with brain imaging which can help show what is actually going on in the brain as patients practice singing the words. "Melodic Intonation Therapy" is a therapeutic process used by music therapists and speech pathologists to help patients with communication disorders caused by brain damage. This method uses a style of singing called melodic intonation to stimulate activity in the right hemisphere of the brain in order to assist in speech production (Wikipedia: Melodic Intonation Therapy (MIT))
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The therapy involves stroke patients being taught to put words to simple melodies plus tapping out each syllable with their hands. Teaching stroke patients to sing (put words to music) helps them form crucial neural connections on the right side of their brain. According to Professor Schlaug, after just a single session, stroke patients who were unable to form intelligible words have begun to learn say simple phrases by combining each syllable with a note of the melody.
Source: BBC News: Singing 'rewires' damaged brain