Ih Welsh the line is - Llais a derin yn y llwyn - "a voice like a bird in the grove (glen?)" is that "yodelling in the valley"? To use another euphemism!

And a Girlfriend in Monmouth, many years ago, insisted she knew the Cosher Bailey chorus as:

Was you ever saw
Was you ever saw
was you ever saw such a funny thing before.

Which has that comfortably convincing rhyme, and consistent tense and is sufficiently unusual to look like a literal translation from the Welsh. Just pointing out............