Mamma Mia! Pop Group is a Swedish pop group formed in 1972, best known for their hit songs 'Dancing Queen' and 'Take a Chance on Me'. The group consists of four members: Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. They are widely regarded as one of the most successful pop groups of all time, having sold over 380 million records worldwide. The group's name, ABBA, is an acronym of the first letters of each of the group's members' first names.