Eurovision glory in 1974 with 'Waterloo' launched this Stockholm quartet—Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad—into disco-pop stardom. Their site touts their 'irresistible hooks,' heard in 'Dancing Queen.' Over 150 million records sold mark their reign. Splitting in 1982, they stunned fans with 'Voyage' (2021). Their joyous sound still inspires.

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