ABBA are one of the most successful pop groups of all times, with their many hits proving dancefloor favourites for more than 50 years. This has been helped by two blockbuster Mamma Mia! films, ...

Add Yahoo as a preferred source to see more of our stories on Google. ABBA in 1974: (L-R) Benny Andersson, Anni-Frid Lyngstad, Agnetha Faltskog and Bjorn Ulvaeus - Credit: OLLE LINDEBORG/AFP/Getty ...