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"Katy Perry&amp;#039;s next single is &amp;quot;a big one&amp;quot;, according to songwriter Bonnie McKee. The singer recently premiered her new track &amp;#039;Roar&amp;#039;, which she co-wrote with McKee for her forthcoming album Prism.  &amp;quot;It&amp;#039;s kind of like every song is its own little movie,&amp;quot; McKee told MTV News. &amp;quot;So [&amp;#039;Roar&amp;#039;] is Rocky and also kind of jungle-y and cat-themed. &amp;quot;And then each song has its own little movie and its own visual to go along with it. So I wouldn&amp;#039;t say it&amp;#039;s all going to be like this.&amp;quot; She added: &amp;quot;Like the next one, as far as I know, is going to be a big one too. I&amp;#039;m really excited for the next one. [The song is] really colourful and really bright.&amp;quot; Katy Perry&amp;#039;s new single &amp;#039;Roar&amp;#039; is expected to sell 450,000 copies in the US during its first week on sale, while the track won&amp;#039;t be released in the UK until September 8. Watch the lyric video for Katy Perry&amp;#039;s &amp;#039;Roar&amp;#039; below:      "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/music/news/a507789/katy-perrys-next-single-a-big-one/>