snap

When Alice was about 11 months old she started "snapping" her fingers to music. It wasn't actual snapping, it was more a rubbing of her thumb and pointer finger. She picked this up from us right away and would do it anytime she heard music. I haven't seen her do this in several months. But apparently she was secretly perfecting her craft. Mark was putting her to bed the other night while I was out. The routine is a bottle of milk while reading books. He had just gotten to the end of a book and Alice snapped her finger at the stack of books as if to say keep em coming. Now this was an actual snap with the thumb and middle finger and a distinctive snap. I saw it for the first time this morning. It's truly amazing. Is this a normal development for an 18 month old or is she a genius?