This is the research field of psychology and pedagogy, and I happen to study psychology. I didn't check the relevant literature. Let me answer your question briefly: there is no necessary connection between the two. The right hemisphere of the brain is responsible for music and the left hemisphere is responsible for mathematics. They are interrelated and influence each other. Good musicology exercises his right brain and improves his ability of attention and endurance, which is helpful to the improvement of other subjects such as mathematics. But it doesn't mean that people with good music must be good at math. Everyone's situation is different. Some children are born with musical talent, but they don't like studying other subjects. They can't learn math well if they don't work hard the day after tomorrow. Some children have good music, and the family pays great attention to cultivating him. He is also interested and can learn math well. This connection is comprehensive, but it is related rather than causal. It is also possible that math is good and music is easy to learn.