The group celebrated 50 years of friendship between Björn Ulvaeus and Benny Andersson
Stockholm, Sweden
History was made last night when all four members of ABBA reunited and performed on stage for the first time since 1982. The four were celebrating at a private party in Stockholm when they took to the stage. Previously the group have been offered $1 billion to reform. The group who won the 1974 Eurovision Song Contest for Sweden are the most successful winners of all time and their music continues to live on, over 40 years after their victory.