Prince's estate is claiming a sound engineer who worked with the musician on five tracks in 2006 is threatening to release the unpublished material and has no right to do so.
The estate and Paisley Park Enterprises have sued George Ian Boxill, alleging he's trying to exploit the songs for personal gain. They say Boxill has no right to the recordings, and they're demanding he return them.
Attorneys for Boxill didn't immediately respond to a request for comment.
The lawsuit says a 2004 confidentiality agreement shows Boxill agreed that all recordings would remain Prince's sole and exclusive property. Prince sings and plays guitar and keyboard on the tracks. Court documents say the recordings, including one called "Deliverance," are worth more than $75,000.
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Record label Rogue Music Alliance plans to release an EP of new Prince music on Friday. The disc version is set for nationwide release on June 2. The tracks on the EP, "Deliverance," were recorded in the studio between 2006 and 2008 when Prince was an independent artist.
Prince died on April 21, of a drug overdose. In June, the Midwest Medical Examiner's Office revealed that the singer died of an accidental overdose.