Weddingbee boards

We're doing a somewhat non-traditional ceremony (it's outdoors and we're using our friend as an officiant; during the "processional" we'll be coming around the sides of the guests and meeting at the middle instead of coming down the aisle).  We asked my fiance's cousin to sing a song during the processional instead of using music.  I have no idea what song we should ask her to sing...does anyone have any suggestions?  Please? :-)  Something nice but not super sappy would be great!

I do like that song...thanks!