Too late now to say sorry? Justin Bieber, Skrillex sued for copyright infringement

Justin Bieber and Skrillex have been sued for copyright infringement by singer-songwriter Casey Dienel for the multi-platinum song Sorry.

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.

"As many of you that follow my career and work have already recognized, JustinBieber'ssongSorrycopies the vocal riff prominentlyfeaturedin my songRing the Bell,"DienelwroteonFacebook.

"Like most artists that sample music,Biebercould have licensed my song for use inSorry.But he chose not to contact me ... In the end, I was left with no other option.I believe I have an obligation to stand up for my music and art."

Her suit claims Sorrycopies a prominent vocal riff from her song Ring the Bell, released in 2014,and loops it.Dienel'slawsuit said her attorney sent a letter toBieber'slawyer and manager explaining the infringement but they didn't respond.

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

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

Dienel'ssong was released on her albumBabyin2014 on the independent record label Dead Oceans.

In a 2014 review,Rolling Stone magazine praisedDienel'svocal ability.

"She's got a MaryPoppins-sizebag of tricks, singing in operatic quivers, howling yelps, haunting harmonic layers and even full-on vocal fry without showing any seams," wrote reviewerCadyDrell. "Dienel'svocal acrobatics stay riveting."