Morricone invented a type of music that we associate with America and that hadn’t existed before. In the score there’s electric guitar, which is completely anachronistic to the story. At the time there were no electric guitars, but we never question it because Morricone uses the instrument with such conviction. That’s partly what I love about him as a composer; he doesn’t let the facts get in the way of what is needed – because undeniably it’s the right music for this film.