"The Rainbow Connection" was written for The Muppet Movie and was nominated for an Academy Award for Best Song in 1979. It is sung by Kermit as the movie's opening number and reprised by the whole cast of Muppets at the end of the movie. The single of this song reached #25 on Billboard's "Hot 100 Singles" chart in 1979.
Kermit the Frog is puppeteer Jim Henson's most famous Muppet creation, first introduced in 1955. He is the protagonist of many Muppet projects, most notably as the host of The Muppet Show, and has appeared in various sketches on Sesame Street, in commercials and in public service announcements over the years