Just to weigh back in with a point I made earlier, the question of "born" ability poses a problem. How do you reliably test a newborn for musical or artistic or mathematical or any other kind of talent? Maybe there is some way to do this, but I'm not aware of it. A lot of the evidence, both in anecdotal and statistical form, is studies of people's proclivities in childhood - two-year-olds, four-year-olds, etc. My belief is that these "talents" and "proclivities" are not genetic but are shaped by (often unpredictable) factors, often in early childhood and pre-conscious. It might be something as direct as a mother singing to her child, or it could be something much subtler. By the time the children are old enough for them to show an interest in music, art, etc., these dispositions are formed, but I'm skeptical that they're in the genes. If they were genetic, then you'd expect to see adopted children demonstrate "talents" related to their birth parents' "talents" and unrelated to those of the adoptive family, and I doubt there's evidence that this happens.
I'll admit not to having researched this specific question, so if someone can point to contrary studies I'm listening. But that's my general impression, and this being an internet forum, I don't mind sharing general impressions without including footnotes.
I'll admit not to having researched this specific question, so if someone can point to contrary studies I'm listening. But that's my general impression, and this being an internet forum, I don't mind sharing general impressions without including footnotes.