Sunday, October 31, 2010 7:20am ET by  
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Katy Perry releases behind-the-scenes footage of 'Firework'

Katy Perry has posted a behind-the-scenes video filmed during the making of her 'Firework' video on YouTube.

Set in Budapest, it features comments from some of the 250 people selected as the pop video extras.

Perry says: "About 250 kids that have a spark and are buzzing and fizzing and have the potential to become fireworks. Music can be so powerful, and I think it can transform you, inspire you and heal you."

Watch the 'Firework' footage below: