One of the few opera stars who retains her voice’s seductive potency as she scales down for small rooms, this American soprano was in Germany with her husband, the conductor Christian Reif, for the first part of lockdown. He joined her on piano in a memorable series of songs they posted on social media. None was more moving than a dreamy, quietly commanding version of Gerry Goffin and Carole King’s Brill Building classic “Up on the Roof,” rising to rapture. Like Mx. Bond’s “Calling Occupants,” it was a love letter to New York as the crisis was at its most intense.