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The group ABBA are back. They will release new songs and a new 
 for the first time in 39 years. The Swedish 
 formed in 1972. They are 
 of the most successful pop groups 
. They are 
 for songs like Dancing Queen. A 
 comedy film called Mamma Mia! was released in 2008. This had 
 of their biggest hits. The 
 later became a stage 
. It is one of the 
-running shows in London and on New York's Broadway.