Actors of the ABBA show “Bjoern Again” perform on a piano at Sotheby's auction house in London, Thursday, August 27, 2015. A grand piano that featured on many of ABBA's biggest hits is going up for auction in London. Sotheby's is offering the instrument, owned by the Stockholm recording studio where the Swedish pop group often recorded. (Photo by Frank Augstein/AP Photo)
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