"Dark Horse" was a wildly-popular hit by Perry that was released on her 2013 album "Prism", and it spent four weeks at the top spot on the Billboard Top 100 in 2014 and earned the pop star a Grammy nomination.
After a week-long trial, a federal jury of nine jurors deliberated and returned with a decision on Monday, agreeing with claims made by Christian rapper Marcus Gray that Perry's single borrowed liberally from his 2009 track, "Joyful Noise".
During the weeklong trial of the copyright-infringement case, the panel heard from Perry herself as well as musicologists from both sides who parsed the contentious 16-second instrumental phrase. Perry was not at the courtroom for the jury's verdict on Monday, according tp the report.
Her attorneys argued that the song sections in question represent the kind of simple musical elements that if found to be subject to copyright would hurt music and all songwriters.
They concluded that the beat of the Christian song was original enough to be copyrighted.
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"They're trying to own basic building blocks of music, the alphabet of music that should be available to everyone", attorney Christine Lepera said during closing arguments Thursday. Gray's album, which included the song "Joyful Noise", was nominated for a Grammy.
Katy Perry performing at Perth Arena in Australia, in 2018. The jury also found that the defendants - including singer/songwriter Sarah Hudson and music producers Lukasz "Dr. Luke" Gottwald, Max Martin and Cirkut - had the opportunity to hear "Joyful Noise" before they worked on "Dark Horse".
Gray's lawyers shot back that the song had been widely disseminated, with millions of plays on YouTube and Spotify and could have been heard by Perry and her co-authors.
On that day, the singer and her attorneys experienced a few technical difficulties when they tried to play "Dark Horse" over the courtroom's sound system.