Christopher Cerf has been played on NTS shows including Diddy Wah, with Watch Your Step first played on 13 March 2023.

Christopher Cerf (born August 19, 1941) is a U.S. author, composer-lyricist, voice actor, and record and television producer. He is known for his musical contributions to Sesame Street, for co-creating and co-producing the award-winning PBS literacy education television program Between the Lions, and for his humorous articles and books.