The first time I saw this song on YouTube, it was a very different version. Same music, but different video, in black and white and more of a large scale dance number, not like the schoolroom theme from the video in this article.

Here is a mix that starts with the color schoolroom version, and then at 3:30 cuts to the older version:

https://www.youtube.com/watch?v=G96luhHhxnI

I wonder if anyone has a link to that old black and white version? I don't seem to find it any more and would be curious to see it again. Thanks!