Prof Trainor stated: "That the children studying music for a year improved in musical listening skills more than children not studying music is perhaps not very surprising. On the other hand, it is very interesting that the children taking music lessons improved more over the year on general memory skills that are correlated with non-musical abilities such as literacy, verbal memory, visiospatial processing, mathematics and IQ than did the children not taking lessons. The finding of very rapid maturation of the N250m component to violin sounds in children taking music lessons fits with their large improvement on the memory test. It suggests that musical training is having an effect on how the brain gets wired for general cognitive functioning related to memory and attention." *

That might not be a graph, statistic or chart but it's one of the most interesting things I've found out so far. Basically the article is about an experiment that had to do with music and the developing brain of kids. There was 6 kids who participated 5 of the boys, one was a girl, both of them were attending the same school of music. Another six kids, two girls and four boys were attending a normal school and not receiving music classes after school. Anyway, with a magnetoencephalography (MEG) machine that tracks and measures magnetic fields outside of the head that are related to electrical field that are produced when neurons in the brain start working, they manage to see the process in which the brain recognizes and processes the information given. This experiment lasted for a year with kids being tested four times throughout, to see how they reacted.