I realize this is an old thread, but I wanted to mention to you that I just asked my daughter ( she's in her last year of Waldorf kinderkarten) if she knew that verse and she said said "sure" and then sang it to me! I don't recall her ever singing that around the house. She said it was a game they played in school in the spring (which means either last year or this past fall) and that it wasn't just the first graders. So at least you know it wasn't isolated to your child's school
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