Refresh:

I'm currently in a conversation with a woman who grew up in New Zealand, and, until the broadcast of Sesame Street and its Americanisms, her mother at least, had never even heard the "Twinkle, Twinkle, Little Star" linked to the Alphabet; she learned the ABCs to the tune of "Jack and Jill Went Up the Hill."

...Her folks (kith, kin, and people around) thought it was a Sesame Street Invention...

Now, I'm even more curious as to when and how this tune and this assortment of letters got hitched. And became so ubiquitous.

Could it have something to do with the early public school system? and mass-produced "readers" for the different grades?