ABBA was a Swedish pop group active from 1972 until 1982. The quartet was formed through the friendship of Benny Andersson and Björn Ulvaeus and their respective girlfriends Anni-Frid Lyngstad and Agnetha Fältskog, and together they topped charts worldwide from the mid-1970s to the early 1980s. The name "ABBA" is an acronym formed from the first letters of each group member's given name.
They remain a fixture of radio playlists and have reportedly sold more than 370 million records. ABBA was also the first pop group from mainland Europe to enjoy consistent success in the charts of the Anglophonic world (mainly the United Kingdom, the United States, Canada, Australia, and New Zealand), and its enormous popularity subsequently opened the doors for other Continental European acts. The music of ABBA has been re-imagined into a blockbuster musical Mamma Mia that has toured worldwide and is in production for a movie version to be released in 2008.