Music streaming app Tidal has been accused of inflating audience figures for two albums - Lemonade by Beyoncé, and The Life of Pablo by Kanye West.
A Norwegian-language newspaper claims the move would have led Tidal to have paid disproportionate royalties to the singers' record companies at the expense of other artists.
Tidal is part-owned by Jay-Z.
He is Beyoncé's husband and a long-term friend of Kanye West.
Tidal has denied the allegations.