In an 18-page motion, the streaming music service's attorneys, Rosenberg & Giger P.C, called the claims "among the least informative and substantive pleadings imaginable."

Sony and Warner joined Universal in the battle against Grooveshark in December last year, with UMG alone filing a potential $17bn lawsuit in November, claiming that the service was directly involved in uploading copyrighted material.

Although EMI has a contract with Grooveshark, it too instigated court proceedings against the company in January claiming that it had ...