Is Katy Perry’s Dark Horse a rip off of this Christian rap song?

Katy Perry has been sued for copyright infringement by a group of Christian hip-hop musicians from Missouri.

The group are saying that not only is Katy’s song Dark Horse a rip off of their song Joyful Noise, but she also exploited it and profited from it. The lawsuit reads: “And by any measure, the devoutly religious message of ‘Joyful Noise’ has been irreparably tarnished by its association with the witchcraft, paganism, black magic, and Illuminati imagery evoked by the same music in ‘Dark Horse’.

“Indeed, the music video of ‘Dark Horse’ generated widespread accusations of blasphemy and an online petition signed by more than 60,000 demanding removal of an offensive religious image from the video” – an Allah pendant was removed from the video in February.

Joyful Noise was released in 2008, while Dark Horse didn’t come out until last year, and while there IS a similar beat in both songs, we can’t be sure. Do you think Katy is a copy cat?