The four former members of ABBA have made a rare joint appearance for the opening of a Stockholm restaurant inspired by the Mamma Mia! musical.

Benny Andersson, Agnetha Faltskog and Anni-Frid Lyngstad showed up for the opening night of fellow former band member Bjoern Ulvaeus' Greek taverna, where guests are invited to sing along to ABBA tunes.

However, they did not sing or pose for photos together and rejected suggestions they would ever perform together again, with Andersson saying: "I don't think so."

The restaurant, where musicians and actors interact with waiters and guests, has borrowed the Greek-island setting from the Mamma Mia! musical and film, but Ulvaeus said: "It's a completely different story."

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