The tune don't have to be clever,
Although I still don't think "Eat all the fruit and throw away the rind" is a line that works particularly well. Feels like Napier and his collaborators were kind of flailing around for a rhyme there.
And it don't matter if you put a couple extra syllables into a line.
It sounds more ethnic if it ain't good English,
And it don't even gotta rhyme.
Excuse me: "rhyne."
- Tom Lehrer, "The Folk Song Army" (1965)