What is the refrain in Sir Patrick Spens, the Wife of Ushers Well, and the Bonny Earl of Murray?

Answer 1

The "Bonny Earl of Murray" has a chorus or refrain. Check this site.

http://www.contemplator.com/scotland/moray.html

I can find no indication that there is one in The Wife of Ushers Well.

http://www.moonwise.com/wife.html

Answer 2

I find no refrain in "The Ballad of Sir Patrick Spens."

http://www.tnellen.com/cybereng/poetry/poems/the_ballad_of_sir_patrick_spens.html