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"In the last twenty years, brain imaging studies have revealed that musical training has dramatic effects on the brain. Increases in gray matter (size and number of nerve cells) are seen, for example, in the auditory, motor, and visual spatial areas of the cerebral cortex of musicians. As Dr. Oliver Sacks writes in his book Musicophilia, "Anatomists would be hard put to identify the brain of a visual artist, a writer, or a mathematician - but they could recognize the brain of a professional musician without a moment's hesitation." Perhaps it is not so surprising that brain areas involved in singing and instrument playing, such as auditory and motor cortices, change following extensive musical training, but a recent paper in the journal Neuroscience suggests yet another way that music reshapes the brain."
Personally, I would say that it's not the musical training that makes the dramatic brain function difference, it's the act of making music, of creativity, that facilitates more and better cross-brain (right to left hemisphere, and back again) communication.