Actually what I thought of were floating verses and not zipper verses, right?

Aren't zipper verses when you just substitute one referent for another, like in this verse from a spiritual called "Ride On, King Jesus"

If you see my mother
Oh Yes.
just tell her for me
Oh Yes.
Just to ride her horse on the battle field
I wanna go to heaven in the morning.

****

Then the zipper would be to substitute "mother" for "father" and change the pronoun to "he" [if you see my father...just tell him for me etc]. The person then could be sister , brother, neighborhood, cousin, aunt, uncle, pastor, deacon etc etc etc.


The referent "zipper song" is a new one for me. Is this what is meant by that term?