"The Music Man," written by Meredith Willson, featured a heroine named Marion Paroo, or "Marion the Librarian." Apparently, she was based on a real life medical librarian named Marion Seeley of Provo, Utah.
I can imagine Willson, the Iowa boy casting himself as Harold Hill, the traveling salesman and (pretended) "musician." (Willson was a real one.) And Willson was married three times, but never to "Marion."
So what made him cast "Marion the librarian" as his leading lady in the play (1957) that was later made into a film (1962)? Was she a (secret) mistress? Did he have a platonic "crush" on her? Did he owe her some emotional debt, perhaps because of her medical expertise?