Hi Erik,
Many thanks for your assistance, enthusiasm and effort.
Well, all these would make for an interesting and diverse adaptation hierarchy:
Le nozze di Figaro (Italian)
-> Jan Hinnerk (Low Saxon)
--> Ik ben met Catootje naar de botermarkt gegaan (Dutch)
---> Eye Level (Instrumental)
+---> Lied van die Boland (Afrikaans)
+---> And You Smiled (English)
From Mozart to Matt Monro, without "Going Undercover"!
However, let's consider the evidence so far:
-> supposedly based
--> probably based
---> sounds a bit like
Sources: Wikipedia, a forum.
I just don't think I can add these unless we can gather something much more explicit, reliable, authoritative.
I'm conscious that if I weren't so tentative and were to add the data, any future web search would bring up SHS with an apparently definitive summary statement saying something like "Eye Level by Jack Trombey was adapted from Ik ben met Catootje naar de botermarkt gegaan, which was adapted from Jan Hinnerk..."
We might even end up creating a circular reference where someone updates Wikipedia by citing SHS. And once something is in Wikipedia, a hundred other sites will copy it as gospel.
Let's leave the topic open and see if any other replies come in. Meanwhile, I'll try researching the information you've kindly gathered. And if you get any further responses on the forum, please upload them.
In the meantime, I won't worry about the Eye Level entry being incomplete; the only indication of a potential hierarchy was the unreferenced Wikipedia mention of an unnamed nursery rhyme.
Cheers,
Dave.