Photo of Agnetha FALTSKOG and ABBA and Anni-Frid LYNGSTAD [Getty Images]

UNSPECIFIED - JANUARY 01: Photo of Agnetha FALTSKOG and ABBA and Anni-Frid LYNGSTAD; Posed portrait of Anni-Frid Lyngstad and Agnetha Faltskog (Photo by RB/Redferns)

Redferns RB