Lawson reveal how they teamed up with rapper B.o.B
15 July 2013 Last updated at 06:25 BST
The British boy band Lawson have been talking how they came to work with rapper B.o.B on their latest single.
Brokenhearted is at number six in the UK singles chart.
The band also said they were shocked by how popular they had become outside Britain, especially across East Asia.
They spoke to Newsbeat reporter Steve Holden at T in the Park in Kinross.
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