Last week, Backstreet Boys took the Pop Clash title from Pink, but can they score another win when faced against Katy Perry?

Like we said before, Backstreet Boys' 'In a World Like This' takes on an encouraging tone. In the track, the guys acknowledge that there are a lot of hardships in the world and a lot of people cave in -- but not them. In fact, they're free-falling in the best sort of way.

Then there's Ms. Perry, who may be shedding her candy-coated image, but her music is still uplifting. On 'ROAR,' Perry is also sending a positive message, telling the world that NO One can hold her down. Just like 'Firework,' the chorus is anthemic and contagious. And don't even bother trying to cover your ears -- there's no way you can avoid her roar!

Which song leaves you feeling more inspired? Vote for the Backstreet Boys’ ‘In a World Like This’ or Katy Perry's ‘ROAR' below! You can vote once per hour until the poll closes at 3PM ET on Aug. 19. Good luck!

Watch the Backstreet Boys 'In a World Like This' Video

Watch the Katy Perry 'ROAR' Lyric Video

Rules of Pop Clash: The artist and song with the most votes wins, and the winner goes on to face a different challenger the following week. If an artist wins four weeks in a row, they will be retired into the Pop Clash Hall of Fame in order to give others a chance to compete.

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