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With their unique potion of humor and forthrightness, the most famous ones, “Where the Wild Things Are” and “In the Night Kitchen,” are as unforgettable as the Pledge of Allegiance or “Twinkle, Twinkle Little Star.”

“Twinkle, twinkle, little star,” Rania sings into the phone.

“Twinkle, twinkle, little star,” I say.

A 1-to-1 ratio means notes are evenly spaced, like in “Twinkle, Twinkle, Little Star,” but a 1-to-2 ratio means the time from one note to the next is uneven, like in “Itsy Bitsy Spider,” Dr. Roeske explained.

Here is an example featuring children simultaneously singing three different children's songs29 that are set to the same tune: "Baa, Baa black sheep," "Twinkle, twinkle, little star," and "The Alphabet Song."