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The most commercially successful pop group of the 1970s, the origins of the Swedish superstars ABBA dated back to 1966, when keyboardist and vocalist Benny Andersson, a onetime member of the popular beat outfit the Hep Stars, first teamed with guitarist and vocalist Bjorn Ulvaeus, the leader of the folk-rock unit the Hootenanny Singers. The two performers began composing songs together and handling session and production work for Polar Music/Union Songs, a publishing company owned by Stig Anderson, himself a prolific songwriter throughout the 1950s and 1960s. At the same time, both Andersson and Ulvaeus worked on projects with their respective girlfriends: Ulvaeus had become involved with vocalist Agnetha Faltskog, a performer with a recent number one Swedish hit, "I Was So in Love," under her belt, while Andersson began seeing Anni-Frid Lyngstad, a one-time jazz singer who rose to fame by winning a national talent contest. In 1971, Faltskog ventured into theatrical work, accepting th...