I first saw this cartoon on TV when I was a kid.  I instantly loved the music, and I remember recording it onto a cassette for one of my mix tapes.  It's such a simple theme and the lyrics have a great message.  It wasn't until I was much older when I found out the music was done by Sir Paul McCartney.  

I love the sound of the children humming along to a simplified version of "We All Stand Together" in the end credits of Rupert and the Frog Song.  It's very calm and peaceful, and I hope this piano arrangement is as well.