Is there another thread about this?

It's Hob a derry dando of course,
but it's obviously Welsh as muxed ip as My Hen Laid A Haddock.

Now - if "Jane" is supposed to come to the glen to sing about *dear sweet Jane" it's reasonable to suppose that "come to the glen" is also a foxed phrase from Welsh, meaning something else entirely.

Welsh speakers- what was it?