From the Classic Days of Sesame Street. This is a song from the late great Joe Raposo. I've had this clip on a tape since I don't know when, and it just doesn't get any credit anymore.

This clip comes from episode 2103, in case you were curious. I don't have footage of the entire episode I'm sorry to say, and this was the only thing from it I copied over to VHS (I had this on Beta).