The Norwegian police economic crimes unit, Økokrim, said on Monday they were investigating allegations that some listening numbers at Tidal Music, owned by Jay-Z, Beyoncé and other stars, were artificially inflated.
A complaint filed last year by groups working for Norwegian artists and record labels said the alleged fraud had deprived other artists of their fair share of subscription revenues.
Tidal, which began life as Norwegian start-up Wimp, has previously dismissed the allegations and its lawyer Fredrik Berg on Monday denied any wrongdoing.
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