It took me a seconds to realize it- if you can't see it the little girl's shirt says Nana Nana Nana ( probably her grandma ) while brother's shirt says Batman. So it's the Batman theme song. Nananananananananananan BATMAN!
Sesame Street: Common and Colbie Caillat - "Belly Breathe" with Elmo minutes) Feeling like a monster? Colbie Caillat and Common recommend a calming breath. "There's a way to calm your "monster" and chill your monster out.
It’s Elmo’s World! Cute Elmo Party Games for Kids: If you’re planning a Sesame Street party, you’ll need some cute Elmo party games for kids! He is, after all, one of the most popular Sesame Street characters among the toddler and preschool set!