The Swedish pop quartet ABBA is one of the most successful and iconic musical groups of all time. Formed in 1972, the group consists of Benny Andersson, Björn Ulvaeus, Anni-Frid Lyngstad, and Agnetha Fältskog. They are best known for their hit songs such as 'Dancing Queen', 'Mamma Mia', and 'Take a Chance on Me'. ABBA has sold over 380 million records worldwide and is one of the best-selling music artists of all time.