FILE - In this Jan. 26, 2010 file photo, Swedish popstars Bjorn Ulvaeus, right, and Anni-Frid "Frida" Synni Lyngstad arrive at the AbbaWorld exhibition in Earls Court London. "ABBA: The Official Photo Book" (Weldon Owen Publishing) chronicles the four band members's history through more than 600 photographs. The authorized photographic biography was released earlier in 2014 in Europe, and just recently in the U.S. (AP Photo/Joel Ryan, File)