On the subject of ABBA. There is a song sung on the Transatlantic Sessions 2 CD, Sung by the illustrious Paul Brady. It contains a riff, played by Jerry Douglas on dobro, to which on hearing my wife said, "that sounds like an ABBA song". I poured derision on this, as you do, but then I listened again and she was quite right.
IT IS DANCING QUEEN!
Talk about stealing from the best?