Song: "Rainbow Connection"
Writers: Paul Williams and Kenneth Ascher
Original Release: June 1979
Performer: Kermit the Frog (voiced by Jim Henson)
Album: The Muppet Movie: Original Soundtrack Recording
This is my second-favorite Muppets song after the one featured in this post, which also explains my lifelong devotion to the felted franchise. The song opens The Muppet Movie and ranks high among the great musical moments in cinematic history, even drawing comparisons from some with "Over the Rainbow" in The Wizard of Oz. The song garnered an Oscar nomination for Williams and Ascher, though they lost out to "It Goes Like It Goes" from Norma Rae. Nope, I've never heard of it either. Time is the truest judge.
Of course, there are plenty of covers. Here are two of my favorites: