Handful of Crumbs (found "Sesame Street" short; 1982)
From The Lost Media Wiki
Status: Lost
Handful of Crumbs was a Sesame Street song and short that first aired sometime in Season 14. It featured Cookie Monster singing how he is sad that his cookie broke into crumbs after holding it too tight while being backed by a country band consisting of Sesame Street monsters, including one who would eventually become Elmo (performed by Jerry Nelson).
While the song itself has been released on three different Sesame Street compilation albums, the short has not resurfaced on the internet in any way and has not aired again since the 1980s.