"It's interesting that Elizabeth had absolute power, being ordained by God, whereas Dylan was given absolute power, which I think happens in the music industry. They give people in the public eye absolute power and then are furious at them at the same time for having it. Dylan is constantly saying, 'I didn't ask for this.'" What's it like being Bob Dylan right after Queen Elizabeth I? Cate Blanchett tells Patrick Barkham about fame, sleep deprivation and losing weight to play a man.