Who wrote it? How long ago? Did he/she profit from it?
Can you copyright the alphabet?
Mozart wrote the music for it (when he was 5), aka. twinkle twinkle little star. I’m not sure who created the order of the letters or who decided to put that to twinkle twinkle little star (or the reverse).
jinx
Mozart most CERTAINLY did not write the tune. I have a book of piano music by the Bach family which includes a delightful set of variations on a French theme which is, most definitely, the tune to which we sing Twinkle, Twinkle Little Star, the Alphabet Song, and other ditties.
Folks, when you make a statement answering questions, it helps if you can back it up with a source of the information in question. My source is a book of music called “The Joy of Bach” and I can get the information on the composer and date if anyone would like (it is currently in storage).
*Doug Bowe: Can you copyright the alphabet? *
Well, Paramount has trademarked the letter Q. 
Everybody got to elevate from the norm - Rush
I saw a play once which claimed Jim Henson was the guy who first paired the music with the alphabet. I have no proof of this, one way or the other.
Beruang, you forgot your smiley.
I didn’t think a smiley was necessary. This is true, I really did see a play which, in all seriousness, gave Henson credit for putting the alphabet to that tune. No tongues in any cheeks, as far as I could tell.
Oh, the site you cite, though cute enough, has earned my wrath for not including the complete lyrics to “Fuzzy Wuzzy.” OK, I suppose that is worth a smiley… 