The ABBA story began in June 1966 when Björn Ulvaeus (born 1945) met Benny Andersson (born 1946) for the first time. Björn was a member of the Hootenanny Singers, a very popular folk music group, while Benny played keyboards in Sweden’s biggest pop group of the 1960s, The Hep Stars.
The pair wrote their first song together later that year, and by the end of the decade they had established a regular partnership as composers. By that time, Benny had left The Hep Stars, while the Hootenanny Singers only existed in the recording studio. The Hootenanny Singers released their records on the Polar Music record label, owned by Stig Anderson (1931-1997), who was to become ABBA’s manager. Stig also contributed lyrics to many ABBA hits during the first years of the group’s career.
In the spring of 1969, Björn and Benny met the two women who were to become not only their fiancées but also the other half of ABBA. Agnetha Fältskog (born 1950) had been a successful solo singer since releasing her first single in 1967. She and Björn were married in July 1971. Anni-Frid Lyngstad (born 1945), also known as Frida, started her recording career shortly before Agnetha. Frida was of Norwegian origin, but had moved to Sweden at a very early age. Benny and Frida didn’t get married until October 1978.
- from abbasite.com