STOCKHOLM (AP) — ABBA has reunited! And that was it and now they’re off in their own lives again. The four members of ABBA made a rare joint appearance yesterday in Stockholm for the opening of a restaurant owned by Bjorn Ulvaeus. They did not sing a note or pose for pictures. The restaurant is inspired by the ABBA musical “Mamma Mia!” and is set in the Greek islands, but it has a different story. Musicians and actors interact with waiters and guests, and singalongs to ABBA tunes are encouraged. Benny Andersson was asked if ABBA will ever perform again, and he said, “I don’t think so.”