When, in 1940, Walt Disney released Fantasia, his radical arrangement of animations set to classical music, he fancied that he might add new segments to it every few years so that it could grow with its audience. Alas, it was not to be. The cost of installing the new ‘Fantasound’ technology in cinemas, plus a public mood made inhospitable by war, meant that his fantasy was soon a box-office flop.