Some 600 students attended the event. Below is a picture of the cast, which includes a seated, smiling Louise Brooks. She certainly stands out, at least in my eye, in the way she holds herself -- confident, relaxed.
I wasn't able to find much on Mr. Bob, except that it was royalty free and performed in a number of schools in the first few decades of the 20th century. I did a quick search, and managed to purchase an inexpensive copy from the turn of the last century. Here is a synopsis which I found online.
And here is a picture postcard of the Horace Mann school from 1920. Check in tomorrow for another blog post with another remarkable and little known image of the one and only Louise Brooks.