Wall Street Journal: After less than three months in the job, interim chief executive Peter Tonstad has been swept out at Tidal, Jay Z’s Swedish music-streaming service. Tidal, closely held by Jay Z and a consortium of artists, will be run by executives in New York and Oslo until a new chief is in place, the official said. Tidal, which has pledged to provide high-quality sound to its subscribers and pay high royalty fees to artists, has had a rough start since its highly publicized relaunch in the spring.