Her piano concert was six years in the making. Then Puerto Rico's power went out

"I was utterly frustrated, Santos said. It was a complete sadness. Puerto Rico's constant outages send old people scrambling to find backup power for ventilators. They spoil the food in people's refrigerators. They force restaurants and shops to close."

"The audience gasped. But then, 20 minutes in, it happened. Mid-song, the power went out with a pop that made Santos nearly jump off her piano bench. Her electronic keyboard went silent."

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