Swedish pop band Abba (an acronym of members Agnetha Faltskog, Benny Andersson, Bjorn Ulvaeus and Anni-Frid Lyngstad) made some of the best pop music of the 1970's. This greatest hits collection was a big seller in Scandinavia, the UK and the US and had the hits "S.O.S.,""Mamma Mia" and "Fernando."