Are we born knowing how to play the piano,but we have to give our brains as much information as we can so it can process information we need to read music and play the piano or any other musical instrument?
Some people just have a natural affinity to music — they can pick it up seemingly instantly, while others have to work their whole lives to become comfortable on a given instrument. It really just depends on the person, many people fall right in the middle of those two categories.