The term 'Scandinavian Supergroup' refers to the Swedish pop group ABBA, which was formed in 1972 and is one of the most successful musical acts of all time. ABBA was composed of two couples, Benny Andersson and Anni-Frid Lyngstad, and Björn Ulvaeus and Agnetha Fältskog, and their music combined elements of pop, rock, and disco. ABBA's hits include 'Dancing Queen, ' 'Mamma Mia, ' and 'Take a Chance on Me.'