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In page Stig Anderson:

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By the late 1960s, Anderson was the manager and producer of Björn Ulvaeus and Benny Andersson, who would become the two main songwriters of ABBA. He joined the careers of these two, after previously managing the Hootenanny Singers, of which Ulvaeus was a member. Later, in 1972, he began managing Anni-Frid Lyngstad, and finally in 1976 Agnetha Fältskog (until December 1975, Fältskog was still bound to Cupol/CBS Records under a contract).[citation needed]