Roger Federer appears alongside Elmo in a new Super Bowl commercial for the running shoe brand, On, that has them debating which letters are actually on the sneaker.

Before heading down to Sesame Street to hang with Elmo and the gang, Este Haim was announced as the executive music producer on the upcoming National Geographic series A Small Light.

Watch Haim Sing the Alphabet With Elmo on Sesame Street Este, Danielle, and Alana Haim joined Big Bird, Oscar, Cookie Monster, Abby, and more in performing a new song about all 26 letters ...