Mamma Mia - here we go again! The four members of Swedish pop group Abba have performed together on stage for the first time in more than three decades.
The unexpected performance at a private gala in Stockholm on Sunday celebrated the 50th anniversary of the day songwriting duo Bjorn Ulvaeus and Benny Anderson met for the first time, paving the way for Abba's global success.
In 2014, Bjorn said: "We took a break in `82, and it was meant to be a break. It's still a break and will remain so. You'll never see us on stage again."
Abba also will not reunite for the money, money, money.
He added: "We don't need the money, for one thing. Usually the reason bands have reunions is that one of them is destitute and the others want to help. Fortunately that has not happened to us."