Group that celebrated its 50th anniversary with a Grammy Record of the Year nomination (4)

I believe the answer is:

abba

(Other definitions for abba that I've seen before include "striped coat?" , "Eurovision winners" , "Waterloo singers" , "Renowned Swedish foursome" , "Father (used of God in New Testament) - Swedish band" .)

I've seen this clue in The Wall Street Journal.

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