Beyond being hugely creative and funny, The Muppet Show series was impressive in the Big Star guests they were able to attract to host, often far out of their comfort zone, which was much of the fun. But I suspect the Muppets had built up so much goodwill that people just simply wanted to perform with them. And so you didn't get typical results for the show, which help lead it to being so creative. And funny.
I tracked down a bunch of those big name, unlikely hosts and will post them from time to time. But I thought that "The Rainbow Connection" was the best place to start. And given that this is such a signature song for the Muppets, and they could have sung it was anyone of their choice (and I'm sure they did it more than once on the show), I find it fascinating that they did it here with Debbie Harry.
It's a lovely, sweet rendition -- but then, most especially when you have Kermit involved, I think it's pretty hard for the song not to be. So, here from 1980 is "The Rainbow Connection" yet again.