Piero Umiliani - Mah-Na-Mah-Na (original mono 45) (1969)
youtu.be
The song that's synonymous with Sesame Street. Featured in the 1969 movie, "Sweden, Heaven & Hell", the song made it to #55 on the Billboard Hot 100, #44 on ...

It was originally for "Sweden, Heaven and Hell" an Italian documentary about alternative sex practices in Sweden. How it became a Muppet thing is beyond me.