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(FILES) In this file photo taken on October 2, 2012 Madame Tussauds waxwork models of Swedish pop group Abba are displayed at a roller disco in the Renaissance Room in London. – There will be something in the air in east London on Thursday, September 2, as Swedish superstars Abba are to break decades of silence with news on a new musical collaboration. Almost four decades since they broke up, leaving fans broken-hearted, the septuagenarian band members are trailing a “historic” announcement, to come via a YouTube videostream and events in London and New York. (Photo by Adrian DENNIS / AFP)