Confession: I'm already married. To be honest, when the day actually arrived, I didn't worry for a second about the music. It came as a bit of a surprise to me - I'd envisaged complicated interactions with the DJ, demanding specific songs, generally directing the flow of music - but in the event, I quite simply had more important things to worry about. And everything went fine anyway.
I still wish I'd put my foot down a bit more firmly about the first dance, though. As requested by my parents-in-law (who, since they were paying for most of it, were thoroughly entitled to a say), we went with a traditional waltz, which went comically wrong when the DJ unsuspectingly played a Vienna box waltz instead of the more standard number we'd been expecting. Neither my wife nor I know how to dance a proper Viennese box waltz, which resulted in much hilarity. Still, you can't win them all.
If we'd gone for a slow non-waltz song instead, though, I'd have chosen this song.
The lyric is a bit more ambiguous than might be considered ideal for a wedding song ("The time has is nigh / When I must remove your wings / And you must try to fly"), but there's a swooning, elegant beauty to the melody which almost makes up for it. Quite simply, it's one of the most gorgeous songs I've ever heard.