I think Abba were amazing songwriters but the original of this song did nothing for me... then I heard SW's and it made me cry. Utterly beautiful. I love that he has covered stuff from artists you just wouldn't expect. Blackfield's Thank You is another example.
One should listen to this song as a whole independent song not just as a cover and it is perfect. This guy knows how to complete and shape a song and make it clearly tasty .) However he should think of us sometimes, I have been spending my days in depressive mode just because of his melodies.