Professor Edmond Chiu, senior researcher at the University of Melbourne during a presentation on Huntington's disease
Our experience is that the Huntington's patient retains the ability to appreciate music ability right to the end. It may be that the part of the brain controlling musical ability and music appreciation is not affected by Huntington's disease. We don't know where the part of the brain is, but where ever it is they appreciate music. That is a very important part of their quality of life." (Dainton, T. p 92)
I found this theory interesting and would not be surprised if it pertains to other forms of brain damage.