'Superman Returns' at 20: Is it a sequel? Is it a reboot? Two decades on, we're still not sure

It's a contested field, but John Williams' majestic "Superman" theme is up there with the best the composer's ever written. Almost five decades on, that stirring orchestral march remains synonymous with Krypton's most famous son, still more than capable of making grown men want to run out of telephone boxes (remember those?) while ripping their shirts open.It's perhaps not surprising, then, that Bryan Singer couldn't imagine using any other music when signed up to direct "Superman Returns", whic