A US court has ruled that Katy Perry has copied her 2013 song 'Dark Horse' from a Christian rap song.
'Dark Horse' is one of Perry's biggest hits, boasting a healthy 2.6 BILLION views on YouTube, but the court has decided that it is too similar to a song called 'Joyful Noise' by a Christian rap group called Flame.
'Joyful Noise' was released in 2011
According to the BBC, during the trial, Katy's team described the beat of both songs as "commonplace", arguing that because of that, Flame could not claim copyright.
"They're trying to own basic building blocks of music, the alphabet of music that should be available to everyone," said Katy's lawyer Christine Lepera during her closing arguments in court last week.