They were the iconic 1970’s pop band who took the world by storm with hits such as Gimme Gimme Gimme, and the ABBA foursome were back together today. It was their first public appearance together in six years, after a performance hiatus, as they attended the first performance of their one-of-a-kind concert ABBA "Voyage" at ‘ABBA Arena’ in London.The Swedish pop group is made up of Agnetha Fältskog, 72, Björn Ulvaeus, 77, Benny Andersson, 75, and Anni-Frid Lyngstad, 76.