The controversial McDonald's commercial based on the H. R. PufnStuf characters created by Sid & Marty Krofft. Late 60s, early 70s. 'McDonaldland' looks a lot like 'Living Island', and the Kroffts would sue McDonald's and eventually win over the blatant copyright infringement in this commercial.
You can download this song in ultra new-fangled MP3 format from this annoying (but free!) site.