When my brother was a toddler and I was his full time caregiver, he and I read multiple versions of books with the same songs, and as a result, I know more than twenty verses of the Itsy Bitsy (or possibly Eensy Weency) Spider. I love Iza Trapani's artwork and lyrics in particular (her little teapot goes to the moon and has an alien on every page).

There are lots of great versions of the Wheels on the Bus. For instance, the Seals on the Bus (go Arrp arrp arrp).

There would probably be a market if somebody wrote a wheels on the bus parody of people's reactions to some toddler twins (though possibly not your toddler twins).

-Jonah (who regularly reads Bear's friendlist)