Rod Stewart's concert on Copacabana Beach in Rio de Janeiro, Brazil, on New Year's Eve 1994, is often cited as one of the largest concerts ever, with estimates suggesting an attendance of 3.5 to 4 million people. https://t.co/4ZdUfLPymq https://video.twimg.com/ext_tw_video/1827845406291640321/pu/vid/avc1/892x720/8ApWwm5hTmyzgrsp.mp4?tag=12