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That first broadcast included “vocal and instrumental music of the highest caliber obtainable” — those being moments from the opera “Tannhauser” — followed by “brief talks by notable men, a bedtime story by one of America’s greatest poet-humorists, and the latest news in bulletin form.”

But when Davidsen sang her encore — “Dich, teure Halle” from Wagner’s “�ղ��ԲԳ�ä�ܲ����” — the splendor of her sound likewise conjured a world unto itself.

At first, it seemed like an odd thing to throw at the character of Wolfram in Wagner’s “�ղ��ԲԳ�ä�ܲ����,” which returned to the Met on Thursday night, with that role sung by the great baritone Christian Gerhaher in his company debut.

The opening night of a revival of Richard Wagner’s “�ղ��ԲԳ�ä�ܲ����” at the Metropolitan Opera in New York was interrupted Thursday night by climate protesters shouting “No Opera” from the balconies on both sides of the opera house.

The singer withdrew this summer from the Bayreuth Festival in Germany, where he was scheduled to perform the title roles in “�ղ��ԲԳ�ä�ܲ����” and “Tristan und Isolde” and Siegfried in “Götterdämmerung.”