[The Beatles were] absolutely by far the most influential and most important band [for myself and Benny Andersson]. It was the idea that two people in a group could write their own songs and we thought, if they can do it, why can't we? That changed everything for us. Before the Beatles, songwriters were very anonymous people and nobody paid any attention to them.
We tried to emulate what The Beatles had done, which was to develop from album to album… to take another step and be more daring
And here's a bizarre reworking of Martha My Dear by a 'pre-Abba' Benny Andersson