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