ABBA was a Swedish pop group formed in Stockholm in 1972 by Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. They achieved international fame after winning Eurovision 1974 with 'Waterloo' and became one of the best-selling music artists of all time with hits like 'Dancing Queen,' 'Mamma Mia,' and 'SOS.' The group disbanded in 1982 but reunited in 2021 with the album 'Voyage.'