For nearly the entirety of the “ Wicked: One Wonderful Night ” TV special, which aired on NBC Wednesday night, the performances were focused on Stephen Schwartz’s songs from the two “Wicked” movies. But for the two-hour show’s climax, stars Ariana Grande and Cynthia Erivo veered deliciously off-topic to cover a medley of songs first made famous 62 years ago by Barbra Streisand and Judy Garland .

Some younger viewers may have been initially puzzled by the mashup, but fans of a certain age, or of a certain show-tune leaning, got it from the very first bar, or might have even dared to anticipate it when Erivo and Grande sat down on stools, side by side. It was the pairing of two distinct standards that both date back nearly a hundred years, “Get Happy” and “Happy Days Are Here Agai

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