As this weekly words' board is is not overcrowded I give it another try. At first sight of this weeks first word 'epithalamion' I thought it was a medical word about the brain, some part of it (that's what you get when you haven't done your latin).
As to wedding poems, when I was a child it was common use at the occacsion of a wedding (or copper,silver, golden wedding feast)that one member of the family laid down the exploids of the couple in an alphabetical epos from A to z on a borrowed melody with a refrain for all to join in.
Now it is completely out of fashion and considered crummy.
I think it was a 19th century left over.