'Dark Knight Rises': Hans Zimmer calls on Batman fans for help

Hans Zimmer has asked fans of The Dark Knight Rises to contribute their voices to the forthcoming film.

The composer recently posted an open invitation on the internet, asking fans to record their voices for a chance to be featured on the film's soundtrack.

"I'm shining the bat-signal up into the sky to call you all!" reads the post. "We need to hear your voices! Now and Loud! We are creating the sound of a worldwide chant."

It continues: "There is no such thing as out-of-tune, no timing we can't fix later. If you mumble, growl, scream or whisper, it's all good. Make it yours.

"If you only get halfway through, no problem! Do it alone, bring your friends, but do it with energy and commitment. Let your voice be heard and be a part of our adventure!"

The website also provides a sample chant for potential participants to mimic.

The chant in question appears to be the same one that was first heard in May on the film's website.

The Christopher Nolan project, which stars Christian Bale, Michael Caine, Anne Hathaway and Tom Hardy, will be released on July 20, 2012.

> Dark Knight Rises: Gotham police under fire in New York set pictures

Watch the Dark Knight Rises teaser trailer below: