From the recording Twinkle, Twinkle, Mama's G'tar

Just after I become a Mom, I came upon the amazing discovery that "Twinkle", "The "ABC Song" and "Baa Baa Black Sheep" are exactly the same melody. d'oh.

"Twinkle" seems to be every pre-schoolers favorite song. In our house we sing the "ABC song" when we have to wait.