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Swedish supergroup that revolutionized pop music and became one of the best-selling bands in history.Formed in Stockholm, ABBA consisted of Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. They rose to global fame after winning the 1974 Eurovision Song Contest with 'Waterloo'. The band dominated charts worldwide with hits like 'Dancing Queen' and 'Mamma Mia', selling over 385 million records....