Don't forget the songs the Muppets also did on The Jim Henson Hour and Muppets Tonight.
You know, when I hear songs from before 1981, I tend to think they'd be good on The Muppet Show. And when I hear songs from the 1980s, I tend to think they'd have been good on The Jim Henson Hour. But hearing 1990s songs doesn't give me that effect regarding Muppets Tonight.
You could also say that The Muppets was dated the moment it was released because they sing Smells Like Teen Spirit, a song from the early 1990s (and I read somewhere that pointed out Moves Like Jagger is from 2011, wouldn't that already date this picture?).
Thought the scene makes me wonder how Kermit survives in such cold weather without clothes. I mean, the other people are wearing heavy clothes.
Although Kermit often wears winter clothes in winter weather, he has also at times not worn extra clothes while outdoors in the winter, and whether he freezes seems to very. In the Gladys Knight episode, when it snows at the end Kermit remarks that he's got a thermal collar on.