How well do you know your movie soundtracks? Is music imperative to your film-watching experience, or is it a fluffy extra that you forget about as soon as the final credits roll?

Below, you'll find 20 songs that acted as the official (and sometimes unofficial) theme for each film.

Some of them were written for the film in question; others were appropriated for the soundtrack and have since become synonymous with it.

Some are ones you'll get instantly, but we've thrown a couple of tricky ones into the mix, too.

How many can you guess before flipping the card to reveal the answer? Do let us know...