???  Yes, that Swedish pop group, because it was featured last night in Horizons of the Oceania Riviera.  Is it that or ABBA?  Doesn't matter. Here is video of ABBA night on the Oceania Riviera. Perhaps the most energy-intensive one event yet on this ship.  Not only the Four Corners band singing, but the six entertainers from the theater show. ABBA: Is a Swedish pop group formed in Stockholm in 1972, the year I received my PhD and began teaching at the University of Hawaii. Of course no one knew who they were back then, until they became Sweden's first winner of the Eurovision Song Contest in 1974 with  Waterloo .  When they won, Agnetha Faltskog was 24 and Bjorn Ulvaeus was 29, they were married, and Benny Andersson was 27 and Anni-Frid Lyngstqd was 29, the other couple, only going with each other. If you look closely, ABBA came from the A and B from the first name of the first couple, and B and A from the second couple. Read about how these two marriages ...