Watch 'Les Mis' Stars' Bizarre Vocal Warm-Ups

Much has been made about Les Miserables' use of live singing in the critically acclaimed Tom Hooper film, and in this brand new behind-the scenes clip, you get to see just how much work it took to get the actors' voices in tip-top shape!

"You walk from the corridor, and from all the different dressing rooms you just hear the oddest, oddest warm-ups," laughs Samantha Barks, who plays Eponine in the film.

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"I play my voice up and finding all this stuff in there you know, it's just been massively enjoyable," adds Russell Crowe. "I only really enjoy things when they're so damn scary."

Click the video to hear a raw snippet of Amanda Seyfried and Eddie Redmayne's romantic duet.

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Les Miserables arrives on Blu-ray and DVD on March 22, 2013.