Non singing roles in musicals

I'm assuming you mean non SOLO singing?   Because I would think most characters sing in at least the chorus numbers.   The older the show, the more examples you have of this.  IMO.  

The first one that came to mind is Mae Peterson in BYE BYE BIRDIE. Anyone who uses the revised script that puts in her song from the television movie is making a terrible choice. 

It's not Broadway and likely never will be, but when I did the regional premiere of "Night of the Living Dead the Musical" last year, Chily Billy Cardille was a singing role simply because I had been hired to play the role and write some songs; in revisions since, the character has been made a non-singing character role only.

When poor Frid in A LITTLE NIGHT MUSIC lost his song "Silly People", didn't he become a non-singing role?

Man in Chair from the Drowsy Chaperone is a non-singing role.

I don't recall Tewfiq (played by Tony Shalhoub) singing in The Band's Visit.  Maybe he hummed a bit.....?

For a quite recent example that could change before Broadway, Philip Stuckey in PRETTY WOMAN is no longer a singing role. I never heard the song he initially had, but I hate that Jason Danieley no longer sings in the show. 

kade.ivy said: "For a quite recent example that could change before Broadway, Philip Stuckey in PRETTY WOMAN is no longer a singing role. I never heard the song he initially had, but I hate that Jason Danieley no longer sings in the show."

What a waste of talent.