Quartet that reunited in 2022 to "perform" as holograms (4)

I believe the answer is:

abba

(Other definitions for abba that I've seen before include "Palindromic 70s pop group" , "Scandinavian supergroup" , "Eurovision winners" , "Swedish pop band of the 1970s" , "Swedish artists" .)

I've seen this clue in The New York Times.

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