Most people would say their secret dream is to be able to sing like an American Idol. The truth is that more people have an undiscovered ability to sing but have never been taught properly.
The only way to find out if you have an undiscovered gift of singing is to allow a vocal coach to test you.
The reason this post is titled Vocal Health for the Singer is because many times, because of abuse, they begin to lose their ability to sing and, many times, even to speak well.
Poor nutrition, lack of sleep and vocal rest, screaming at football games, etc., can all harm the delicate instrument within you that creates sound. Your voice can only take so much abuse, and then you lose the ability to sing well.