We Are Family Sister Sledge
This image appears in the gallery:
ABBA's Agnetha Fältskog In Pictures
At the time of their engagement, Ulvaeus was working with a songwriter named Benny Andersson. Andersson was engaged to Anni-Frid Lyngstad, who, much like Fältskog, was becoming an increasingly popular singer in Sweden. The two women sang back-up vocals for their fiancés and performed with them at small concerts. Then went on to form ABBA and eventually make musical history.