Good Literature at Any Age

This morning when I was parking the van in front of some one's house, a dog in their front yard began barking at us. Without hesitation and with perfect pronunciation, John (2-3/4) recited:

"Hark, hark, the dogs do bark.
The beggars are coming to town.
Some in jags and some in rags,
And some in velvet gown."

Then he added, by way of explanation to me, "There was a dog barking."

I know I'm making certain parenting mistakes right and left, but it made me happy to know that John has very few popular references, but he knows obscure nursery rhymes.