Vocal difference between Marisa Abela and Amy Winehouse
Amy Winehouse people paid to hear that specific tone in singing. There was something inexplicable, which the nation could sign out loud too
Marisa Abela did her own signing for Back to Black. The specific reason why Amy got it, Marisa did not. Sounded like a cat shrieking and had no feeling at all. My girlfriend called it out first, saying "what is that?", just sounds awful.
The film Back to Black would have been very different if the original recorded audio from Amy Winehouse was used. At least the film made a profit for a low budget movie.