What do ABC and Twinkle-twinkle-little-star have in common?

So, what do these 2 songs have in common? Twinkle-twinkle-little-star & ABC? Other than the obvious part that they are children's lullabys... Its interesting the little nuggets of wisdom we pick up these days as parents, sometimes these things just jump out of no where!!!

Still don't know what they have in common?
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. A.B.C D E F G.... H I J K L M N

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. Twinkle twinkle little star....
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. NOW Hum their respective tunes...
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. WEIRD HUH?!?!