This is interesting research but
http://www.down-syndrome.org/research-highlights/2120/http://www.dartmouth.edu/~readingbrains/George_Psychonomic_5101.pdf
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3101523/the research does indicate that anyone that takes music lessons, particularly piano or strings, has increases in working memory. I heard in the lecture that IQ was raised 6-7 points, across the whole group, compared to the control group after just one year of piano or string lessons.
Now, just taking lessons doesn't mean you become a YoYo Ma. But training does make a difference. I heard my DD7 commenting on a art sculpture, using comments about form and color I didn't know existed at 7. I did not develop my eye for art until I was 19 and I remember the moment sitting in the Modern when it happened. She gets it already because of exposure, not because she was born with it. Though being visual spatial does help.
That she was born with.
Ren
