Secondary Skills and Opportunities

Sometimes I wonder how things would be if we didn't need the secondary skills to go with certain things or how the world would be if everyone had the same opportunities.

Consider this: Something within Sam would make him the best violin player ever to walk the earth.

Unfortunately, Sam has grown up in the slums of Chad and never even hears a violin, much less gets the chance to practice or own one. OR perhaps Sam has all the skills and brains to be a great violinist, but he has stage fright or he loses a hand in an accident or some other issue that keeps him from actually showing this talent to the world.

Then I wonder how that plays out in my classroom. Bad test takers? Less-than-ideal backgrounds? Other handicaps physical or mental that might keep a kid from doing her best?