Are people born already knowing how to play piano but they have to unlock piano knowledge in their brians?
We are born knowing how to play the piano, but we must give our brains as much information as we can so that it can process the information we need to read music and play the piano or other musical instrument?
Some people are given rare gifts in terms of musical talent. But we are NOT born knowing how to play instruments.
Some people are born with the talent, some have to work hard at it.
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.