Covid-19 shoved Jeff Sweat into a medical coma for three weeks last winter, face down on a ventilator, on death's trap door. ...Sweat and several other patients with serious medical complications caused by the virus attend weekly opera classes via video conference, conducted by members of the Los Angeles Opera and music educator Rondi Charleston. "When you are intubated, you forget how to drink and breathe," Sweat said. "It was like breathing was a second language. Singing helps me connect. Breathing to a purpose. It gave me reason to learn how to breathe again."