Girl Battling Cancer Sings Katy Perry's Roar

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Even though Olivia Wise's struggle with brain cancer has left her unable to stand or take deep breaths, she took her time in the recording studio to record Katy's hit. Check out Katy's response.

Check Out Katy Perry's New Single, "Roar"

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'Roar' is the first single from the anticipated release of Perry's fourth album, "Prism". In this newest endeavor, Katy is shedding her sugary, outlandish persona and adopting something darker. 'Roar' does have the twitter-verse in a tizzy due to it's resemblance to Sara Bareilles' new song Brave.

Re-defining yourself isn't easy, good luck Katy.

And You're Gonna Hear It

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And You're Gonna Hear It
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On the radio, every five minutes, all last summer.