What's My Letter? is a Sesame Street game show hosted by Guy Smiley from season 3. Prairie Dawn was the show's guest, and the object of the game was to guess a letter of the alphabet, given some clues. She manages to get the answer right when she hears the prize will be a mouse - which frightens her! This was one of many tracks from the 1971 LP The Muppet Alphabet Album that was later recorded as a segment on the show, with the puppets lip-synching to the original album recording.