What circumstances promote "naturally occurring" AP in a child? Equivalently, in the theory presented here, why does a child anchor his tone perception to one key or note? There are several possibilities. He may be deliberately taught. His parents may try to "discover" if he has AP and inadvertently teach him. He may be bombarded with music, mostly in one key if my theory is right. (Of course, this need not be C-major.) He may, as a toddler, hear his older brother repeatedly practicing the C-major scale or a simple piece in C