Quote Originally Posted by lardy View Post
Which structures did ABBA use that weren't being used before?
Who said they were never used before? What ABBA did was fuse rock, pop and dance elements, used globalised lyrics, had hooks all over the place, scaled back the drums and bass, took the production of pop music very seriously, and in the tradition of Swedish music they focussed heavily on the melody. The result was a recipe for chart success that has been copied ever since.