A song by Cookie Monster.
"Know what this letter is? It's the letter C! Let's think of things that start with the letter C Cookie starts with a C! Let's think of other things.
Ah, who cares about other things?
C is for cookie, and that's good enough for me
C is for cookie, and that's good enough for me
C is for cookie, and that's good enough for me
Oh, cookie, cookie, cookie starts with C!".
Then he does "C is for cookie, and that's good enough for me" some more. He also mentions some other things that look like a cookie.
There have been 2+ remakes. 1 similar to the original but with other muppets helping in the chorus and one opera version. | 
