Today I was listening to the Spanish recordings of Mamma Mia, Dancing Queen, Hasta Manana, Move On, and all those, and I realized that something sounded a little off. Not just because the songs are in Spanish and I'm more used to the English one.
In the normal ABBA songs, Bjorn and/or Benny are singing in the background, too. In the Spanish versions, you can just tell that something sounds different, even though in the English versions, B&B's vocals aren't too prominent. Without Bjorn and Benny, you don't get the true ABBA sound.
You get what I mean? :P