D

 D  is the 4 t h letter of the English alphabet. It It 1 st sponsored  SESAME STREET  episode 00 1 6, after sponsoring the very 1 st test show.

An animate d letter D appear ed in " Letter Son g " in ''[http://muppet.wikia.com/wiki/What%27s_the_Name_of_That_Song%3F_(video) What ' s the Name o f That Song ? ]''

Son g s about D

 * " D ee, Dee , D ee "
 * " D Duah Duah "
 * " Disco D "
 * " Daddy Dear "

Sketch e s about D

 * The Type write r - D - Daisy
 * Speech Balloon - D - Dog
 * D Lecture