Swedish group that won Eurovision in 1974 (4)

I believe the answer is:

abba

(Other definitions for abba that I've seen before include "famous pop group" , "6 24 113 [SCAN-DIN-AVIAN] band" , "group of four stars?" , "Scandinavian supergroup" , "rhyme scheme" .)

I've seen this clue in the Universal.

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