Skateboard P stopped by Sesame Street to teach about the letter "B." Pharrell sat down with Cookie Monster and Elmo to perform "B Is For Book." Pharrell sings with the puppets "You can go anywhere without leaving the chair by reading a book. You can be anything, a pirate, a king. Just grab a book." The heavy Reading Rainbow vibes song then takes the three pals on a trip to Ancient Egypt. Watch the clip above.