In the stage show of "The Hunchback of Notre Dame" Quasimodo is deaf and can't speak clearly (bc bells) but sings beautifully (his "inner voice"). A fascinating 2016 staging cast a deaf actor as Q; he sings in sign as a gargoyle supplies his "inner voice":
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(Incidentally, if you've only ever seen the animated film, you're missing my favorite Alan Menken score! The stage show is totally rewritten, has ~double the music (it's mostly sung through), and spectacular orchestrations. A sampler: youtube.com/watch?v=VIoxqM)
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