If you like that, there's another person you should check out. Two years ago on that same TV show, a young man named Paul Potts had an audition. He's a rather plain looking fellow, not someone who would stand out as being "a star". People were jeering him too, and when he said he was there to sing opera, the judges, including Simon Cowell, all rolled their eyes.
Then, he started singing. Literally everyones jaw dropped, and people were speechless. Paul sang a song made famous by Pavarotti called "Nessum Dorma". This unknown young man who was a cellphone salesman, also happened to be one of the worlds finest tenors. Today, after two successful albums, he is ranked up there with the worlds finest tenors. Men like Andrea Bocelli and the late Luciano Pavarotti. It is one of the most amazing, inspiring things I've ever seen. Even if you don't like Opera music, Paul Potts will make you a fan. He's that good.
Susan Boyle is the same sort of person, and story. A shy, basically unknown person, who has a voice that is pure perfection. She is an amazing singer. If you want to see Paul sing, just go to Youtube and type in the search box "Paul Potts sings Nessum Dorma", you will not be disappointed.