This is choir piece from Steven C Warner and the Notre Dame Folk choir. It has an intricate four part refrain so if you aren’t up to that it will be less wonderful, but it is doable with a single melody line.
The text is in the sample at WLP where the sheet music can be purchased.
The Notre Dame Folk Choir:
The Notre Dame Folk Choir teaching the refrain then singing:
An appropriate wedding song:
Harp and flute!