I assume you're talking about children of ABBA's principal members? Bjorn Ulvaeus and Agnetha Faltskog had two children during their marriage: Linda (born 1973) and Christian (1977). Both performed...
1970, when they were a cabaret act called Festfolket and Benny and Bjorn's "Hej, Gamle Man" song was famous. Most people think ABBA started in 1972 with "People Need Love". 1972 was their first year...
Well, that depends on when you consider the group was formed. Bjorn Ulvaeus, Benny Andersson, Agnetha Faltskog and Ani-Frid Lngstad started playing together in early 1970 and first recorded together...