There's also some anecdata floating around in the -- what would you call it, the "competitive speed typing" community? Or "people who play TypeRacer a lot". Some seemingly significant correlation between skill in typing and piano. Or at least the appearance of skilled typists having some interest or experience in piano. This could probably be generalized to being good at fingering or timing, or maybe even further, to having effective mindsets or attitudes regarding performance of skills (like the need for a presumptive confidence of sorts), or being aware of good practice methods.