Now this is a great find! Here is the complete opening sequence to the 1960's Japanese puppet show, Hyokkori Hyoutan Jima.
For those who aren't aware, this classic children's show figured prominently in Isao Takahata's Ghibli masterpiece, Omohide Poro Poro. It happens to be one of the film's dramatic high points, and the concluding scene - where young Taeko-Chan sings along to the Hykkori Hyoutan Jima song to console herself - happens to be the banner to Conversations on Ghibli.
So, if you were wondering what that scene at the top of the page is from, now you know. Well, you should have already known, since I've shown Omohide Poro Poro a couple times when it was available on YouTube. But now all the new visitors know.