#4 Bjorn Ulvaeus (left) and Benny Andersson of Swedish pop group ABBA, 1999.

#4 Bjorn Ulvaeus (left) and Benny Andersson of Swedish pop group ABBA, 1999.

ABBA: The Swedish Pop Sensation of the 1970s that Rocked the World

#4 Bjorn Ulvaeus (left) and Benny Andersson of Swedish pop group ABBA, 1999.

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