Science is learning more & more about how people are simply 'wired' differently and have different abilities. One can, with practice, do 'better' in some things, but musical skills, math skills, etc, seem to be given out in ways we don't understand yet. I have GREAT difficulty with the intricasies of music theory, but I have very good spatial and temporal sense. I can sit and look at a room and KNOW how furniture will fit into it, and how long it will take to do the job.(some of this is just calibrating the brain to 'see' the relationships, but some people can just never manage this)....and I can program VCRs and digital watches without the instructions!

My wife, on the other hand, used to design computer programs, and would 'see' relational database structure in her head!

So...sure..I am not a bit surprised that musicians have been found to have brain structures that are different. Wouldn't it be fascinating to have a scan of Mozart or Beethoven? Remember, Beethoven did his final composing while deaf...'hearing' all those things in his head!