There are many verses, regional or at the whim of the singer (but I wish that "wedding song" could be deleted from the heading. Birthday, Saint's day, mother's day. Locally the music is used for a good night song- but not for a wedding.

One common verse I didn't see above (or I missed it)-

Quisiera un San Juan, quisiera ser un San Pedro
para venirte a cantar con la musica del cielo.

I would like to be a Saint John, I would like to be a Saint Peter
To sing to you with the music of heaven.