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Companies that control the music of the late Prince have filed a copyright-infringement lawsuit against rapper Jay Z’s Roc Nation over the streaming of Prince music by the entertainment company’s Tidal streaming service, reports the Minneapolis Star Tribune.

The suit, filed in federal court on Tuesday, reflects an escalation of an ongoing court battle between representatives of Prince’s estate and Tidal over the rights to stream Prince’s music.

According to the paper, the suit claims that although Roc Nation, which controls Tidal, has asserted in court that it has oral and written agreements to stream Prince’s music, the company has provided no documents to support that assertion despite written requests.

The Prince companies — NPG Records Inc. and NPG Music Publishing — are asking for a jury trial and requesting that the court stop Tidal from selling or streaming most of Prince’s music. The suit also seeks unspecified damages, according to the Star Tribune.

Roc Nation did not respond to the paper’s request for comment.

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