A rare opera moment: Plácido Domingo and Renée Fleming at L.A. Opera show what might have been

In May 2014, Plácido Domingo and Renée Fleming flew into town to help Domingo's Los Angeles Opera close the 2013-14 season. The unwary might have thought that the two superstars were going to perform together. But the closest they came to performing with each other was a joint photo op. Domingo...