ABBA is a Swedish pop music group, who had many hits in the 1970s in Stockholm and early 1980s. ABBA is the most successful Swedish music group of all time and was the most commercially successful pop group of the 1970s. ABBA became very popular after they won the Eurovision Song Contest in 1974. They had many hits. These included "Dancing Queen", "SOS", "Money, Money, Money", "Mamma Mia", and "Waterloo". Most of their songs were written by Ulvaeus and Andersson. Shop Official ABBA Merch Now! #abbamerch #abbamerchandise