A-list singers attend the Roc Nation: Tidal Streaming App press conference in NYCbr Caption: Roc Nation hosted a super star-studded press conference at Moynihan Station in NYC on Monday. Alicia Keys, Beyonce, Jay Z , Nicki Minaj, Madonna, Usher, Rihanna, Daft Punk, Jason Aldean and others were front row for the epic announcement of Jay Z's new streaming app, Tidal.