UNSPECIFIED - JANUARY 01: Photo of Agnetha FALTSKOG and ABBA and Bjorn ULVAEUS and Anni Frid LYNGSTAD and Benny ANDERSSON; L-R: Bjorn Ulvaeus, Anni-Frid Lyngstad (back), Agnetha Faltskog, Benny Andersson - posed, studio, group portait (Photo by RB/Redferns)