The only bit I have pictured in any detail is the music (maybe 'The Book of Love' by the Magnetic Fields. Or Johnny Cash's 'It Ain't Me, Babe'). It doesn't matter if the selection is slow or fast, but couples shouldn't scramble to select it. If you have ever gone dancing or on a road trip or had a romantic bout of serenaded sex on a winter night, you should have a few to pick from. If not, you probably shouldn't be getting married.