This was a soaring sing-along, dance party and love-fest in Rodrigo’s first appearance at the Chelsea at the Cosmopolitan. It was a legitimately packed show, with standing/GA seats exceeding $400 three hours before Rodrigo took the stage. More than 3,000 teens and fans in their 20s turned out for the emerging singer-songwriter, alternating between acoustic guitar and a crystal-encrusted grand piano.