i'm not going to post songs because i have way too many that i love for such an occasion, but i just can't project a song onto a hypothetical relationship. another problem i have is that many of the songs i love i associate with someone or another time in my life, so it somehow seems wrong to me.
what i will say is that i've always been mildly obsessed with christmas weddings (and the green, the snow, and all that is beautiful about that time) which definitely lends itself to a musical direction, at least in part.