The first ABBA studio recording that I ever heard was "Knowing Me, Knowing You". I remember the day I heard it for the first time and that's when I realized how much I loved it.
The funny thing, though, is when I saw my friend watching the promotional clip and saw Bjorn lip-syncing to the lines "This time we're through, this time we're through
This time we're through, we're really through", I was like "WHAT?!?!? That's a man's voice?!?" Seriously, I thought that it was Frida singing that. In the Spanish version she is, but not in the English version. :P
Just thought I'd share that funny experience. :P