Swedish: [ˈâbːa] ; formerly named Björn & Benny, Agnetha & Anni-Frid or Björn & Benny, Agnetha & Frida) are a Swedish pop supergroup formed in Stockholm in 1972 by Agnetha Fältskog , Björn Ulvaeus , Benny Andersson , and Anni-Frid Lyngstad . The group's name is an acronym of the first letters of th...