Palindromic "Mamma Mia" band (4)

I believe the answer is:

abba

(Other definitions for abba that I've seen before include "Bishop" , "rhyme scheme" , "Group winning the 1974 Eurovision Song Contest in Brighton" , "Palindromic 70s pop group" , "Swedish pop band of the 1970s" .)

I've seen this clue in the USA Today.

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