Absolutely, Stritch in Company!
And Preston in Music Man, and many of the gangsters in Guys and Dolls, etc. (Although, I think Sky could have a great voice and not care about it. He is already incredibly smart and not remotely a typical gangster. If he sings well, it can work for the character as yet another "talent" he possesses among so many.)
And see, Barbara Cook as Marian works for me. First of all, she's a music teacher (with some training) living in a small town, repressed and focused on her "small life." She could easily have an undiscovered glorious voice and (for me) it would work for the character.
That's what I mean. It's about believability for the role.
Do I think a Rose could have a glorious voice? Yes, but she'll have to make it work for the CHARACTER, not just for the songs. I need to see and understand why that Rose wouldn't have been discovered as a major star. Was she lacking self-confidence? Or drive (not Rose!) ... or circumstances? (No, Rose clearly made her OWN circumstances). See? It's not as easy to be believable in the part if you can sing it brilliantly. Especially since Rose so clearly (if privately) wanted to be a big star.
"Jaws is the Citizen Kane of movies."
blocked: logan2, Diamonds3, Hamilton22