A couple I don't think were mentioned above (apologies if they were):

The Wedding - a UK hit for Julie Rogers in the 1960s
Hawaiian Wedding Song - also recorded by her, and others
To The Aisle - The Five Satins

And for light relief how about:

It Should Have Been Me - recorded by Gladys Knight & The Pips, and Yvonne Fair
DIVORCE - Tammy Wynette (or the Billy Connolly version for more laughs)