I've always wanted to go to a wedding where they sang "Another Wedding Song" from Closer Than Ever. It's sweet.
Other good songs for weddings:
I Love to Cry at Weddings (Sweet Charity)
Marry Me a Little (Company)
We Make a Beautiful Pair (Shenandoah)
There Will Never Be Another Love (Heisler & Goldrich)
hmm
[title of show] on Broadway. it's time. believe.