Crossword Genius

Group whose songs are featured in "Mamma Mia!" (4)

Ross

I believe the answer is:

abba

(Other definitions for abba that I've seen before include "Palindromic Swedish pop group who sang ` `Waterloo' '" , "Palindromic 70s pop group" , "rhymes in Petrarchan sonnet" , "group of four stars?" , "Biblical pop" .)

I've seen this clue in the USA Today.
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