Supergroup with its first new album (2021) since 1981 (4)

I believe the answer is:

abba

(Other definitions for abba that I've seen before include "Old group" , "group of four stars?" , "Bishop" , "Group winning the 1974 Eurovision Song Contest in Brighton" , "Father (used of God in New Testament) - Swedish band" .)

I've seen this clue in the Newsday.

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