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The playing and composition
of music has always been considered the near-exclusive province of the
brain's right hemisphere. This turns out to be far from the truth.
For example, non-musicians use both hemispheres in musical matters; the
right side for recognizing melody and intonation, the left for such analytical
matters as rhythm and notation. However, professional musicians, as their
demonstrate, use their left hemispheres for just
about everything of a musical nature. So much for the right-hemisphere theory.
The comparison of magnetic resonance images of 27 right-handed musicians and 27 right-handed nonmusicians have shown that even their brain structures differ. The corpus callosum---that inter-hemisphere information highway--- is 10-15% thicker in musicians who began their training while young than it is in nonmusicians. Our brain structure is apparently strongly molded by early training. The corpus callosum in musicians is essential in such things as finger coordination. Like a weight-lifter's biceps, it enlarges to accommodate the increased tasks assigned to it.
(Anonymous; "Music of the
Hemispheres," Discover, 15:15, March 1994.)