The Muppets Celebrate Jim Henson, on CBS
IMDb; Muppet Wiki; Wikipedia

This TV movie special was to pay tribute to Jim Henson upon his death in 1990. I don't remember it that well, but it really was pretty good. Also, it had a group rendition of the song Just One Person, which I really liked. Anyway, I hope to see the special again someday, so I can write up a proper review.