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Bars and Melody explain how to write rap

22 July 2014 Last updated at 08:24 BST

Bars and Melody shot to fame on Britain's Got Talent after charming the nation with their anti-bullying rap.

They made it all the way to the final and now Simon Cowell's record label has snapped them up to release a song.

They popped into the Newsround studio to chat to Leah and explain how to write the perfect rap.