Abba, Swedish pop music group (1972 - 1983), Björn Ulvaeus (* 25.4.1945), Benny Anderson (* 16.12.1945), Agnetha Fältskog (* 5.4.1950) and Anni-Fried Lyngstad (* 15.11.1945), 1980s Stock Photo - Alamy
ABBA - Wikipedia
Abba and engineering: how Swedish music took over the world - Engelsberg ideas