Mama Mia band (4)

I believe the answer is:

abba

(Other definitions for abba that I've seen before include "rhyme scheme" , "famous pop group" , "Palindromic Swedish pop group who sang ` `Waterloo' '" , "rhymes in Petrarchan sonnet" , "Group winning the 1974 Eurovision Song Contest in Brighton" .)

I've seen this clue in The Sun.

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