American pop icon Lady Gaga took the stage on Rio de Janeiro's Copacabana Beach on Saturday (May 3) night in a free concert that is expected to draw more than 1.6 million people and be one of the biggest of her career. The 2016 Olympic host city is hosting large-scale free events featuring global stars as a way of filling hotels, bars and restaurants that have been struggling in recent years with an economic and public security crisis. The city estimates that Gaga's visit, funded mainly by priva