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ABBA is a Swedish pop group formed in Stockholm in 1972, consisting of members Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. The name 'ABBA' is an acronym of their first initials. They rose from Eurovision winners in 1974 ('Waterloo') to become one of history's best-selling music acts, with over 400 million records sold worldwide....