Bjorn Ulvaeus at the launch of the 'Abba: Super Troupers' exhibition, at the Royal Festival Hall, London, which runs from December 14th 2017 until April 29th 2018, and recreates Abba's rise to international fame in a series of immersive exhibits. (Photo by Dominic Lipinski/PA Images via Getty Images)
HANOVER, GERMANY - SEPTEMBER 30: Former ABBA member Benny Andersson, Norwegian singer Wencke Myhre and German presenter Carmen Nebel during the tv show 'Willkommen bei Carmen Nebel' at TUI Arena on September 30, 2017 in Hanover, Germany. (Photo by Isa Foltin/Getty Images)
HANOVER, GERMANY - SEPTEMBER 30: Former ABBA member Benny Andersson and Norwegian singer Wencke Myhre during the tv show 'Willkommen bei Carmen Nebel' at TUI Arena on September 30, 2017 in Hanover, Germany. (Photo by Isa Foltin/Getty Images)
HANOVER, GERMANY - SEPTEMBER 30: Former ABBA member Benny Andersson arrives at the tv show 'Willkommen bei Carmen Nebel' at TUI Arena on September 30, 2017 in Hanover, Germany. (Photo by Isa Foltin/Getty Images)
Swedish pop group Abba, wearing kimonos, 1976. Left to right: Bjorn Ulvaeus, Agnetha Faltskog, Frida Lyngstad and Benny Andersson. (Photo by RB/Redferns/Getty Images)
