Swedish supergroup ABBA may be reuniting to celebrate their first hit, which celebrates its 40th anniversary next year. Singer Agnetha Faltskog told a German newspaper that they are thinking about ways to celebrate “Waterloo.”

“Of course it's something we're thinking about,” Faltskog, 63, told Welt am Sonntag, when asked if a reunion was possible, reports SkyNews. “There seem to be plans to do something to mark this anniversary in some way. But I can't say at this point what will come of them.”

She did say that as they grow older, it’s harder to get everybody to work together again. “I cannot imagine that we would go on stage with crutches,” she joked.

The other members of the band are Bjorn Ulvaeus, Benny Andersson and Anni-Frid Lyngstad. They have never had a reunion and haven’t performed together since the 1982 album The Visitors. The Hollywood Reporter notes that the last time the four were seen together publicly was in 2008, for the Swedish premiere of the Mamma Mia film.

ABBA’s string of success began when they performed “Waterloo” on the Eurovision Song Contest and won in 1974. That catapulted them onto a Rock and Roll Hall of Fame career that included 380 million records sold worldwide. Their other hits include “Dancing Queen” and “Super Trouper.”

Faltskog told Welt am Sonntag that if they are going to do a reunion, they have to jsut do it and not think too hard about it. “That eats up too much energy. Don't just think about it, just do it,” she said.

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