Tidal Rave: Rapper and entertainment mogul Jay Z's recently acquired streaming music service Tidal relaunched with a star-studded press event in New York yesterday (3/30) with artists including Jason Aldean, Jack White, Madonna, Usher, Rihanna, Nicky Minaj, Kanye West and Beyonce. Each is said to have a small stake in the company, which is being promoted as "the first-ever artist-owned global music and entertainment platform." Jay Z acquired the Swedish company early this year. Tidal doesn't offer a free ad-supported version, instead offering monthly $9.99 "standard audio" or $19.99 CD-quality subscriptions. More here. Watch the presser here.