Brief mention of Jason -- go here for full article:
Then she remembered Jason Flemyng. She coached the actor when he played a singer in the movie Rock Star. After hearing him the movie's producers had decided that perhaps singing wasn't his thing. "He could not sing at all," she said. "It was a pitching thing."
Instead, she had to teach him how to mime. "You have to learn how to sing and to breathe so that it looks convincing. People think that it is easy, but it is not. But by the end of it he was fantastic."