Pop Quiz

I found it rather funny timing that just a week or two after playing for a production of Gilbert and Sullivan's The Pirates of Penzance, I found myself spending a busy week's worth of evenings in a pit for a high school production of Thoroughly Modern Millie.

I will give a prize to anyone who can tell me [without Googling it!] the connection between these two shows.

And because I find it interesting, I will post the answer sometime soon.