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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.
