Once again we are reminded not to judge a book by it's cover. I've heard people say different things to define themselves such as "my work defines me" or a person is defined by what they do and not what they say. We are what our lives reflect of us both in private and in public, in speech and in action, externally and internally, and by our talents of lack thereof.
Watch the reaction of the judges and the audience before her performance.
BUT also Listen to what the woman in the middle says at the end of Susan Boyle's Performance.