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NASHVILLE, Tenn. (AP) — Justin Bieber and Skrillex have been sued for copyright infringement by singer-songwriter Casey Dienel for the multi-platinum song “Sorry.”

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Dienel, who performs as White Hinterland, filed suit against the two performers and their publishing companies, Universal Music and co-writers in federal court in Nashville, Tennessee, on Wednesday. The suit claims “Sorry” uses a vocal riff from her song “Ring the Bell.”

Representatives for Bieber and Skrillex didn’t immediately return requests for comment Friday.

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Dienel’s song was released on her album “Baby” in 2014 on the independent record label Dead Oceans. Dienel’s lawsuit said her attorney sent a letter to Bieber’s lawyer and manager explaining the infringement but they didn’t respond.

Dienel is asking for unspecified damages and attorney’s fees.

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