@Ogitoc groe sum,
Intelligence is currently defined as the ability to learn from experience, to think rationally, and to deal with others.
While a savant can play extremely difficult pieces of music or remember certain things like dates, people, facts, etc., it does not necessarily make them intelligent. They have the ability to learn, but thinking rationally and communicating with others can be impaired. They're like everyone else in the sense that they excell in certain areas, but are averge/below average in others.