Since usually (at least at all the weddings I’ve attended), the music people walk down to is instrumental. Therefore, the words would seem to be irrelevant.
The mods probably won’t let this next part through, but I’ve always thought it would be really cool to walk down to the second section of Chopin’s funeral march. I figure those who don’t know it will just think it’s a beautiful piece of music, and those who do know will be amused.