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The major factor will be whether the director is happy with the voice actor's singing voice. Speaking lines of dialogue and singing songs are two different skill sets and people who are good at one are not always so good at the other. Two examples from Disney would be the characters Jasmine and Mulan. Linda Larkin voiced Jasmine and in most critics' opinion, ...


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Sometimes the reverse can happen to where the director is happy with the singing performance but not with the acting performance. Nightmare Before Christmas comes to mind. Danny Elfman the composer wanted to play Jack and Tim Burton was very happy with his singing but didn't feel the dialogue was flowing well so he kept Elfman as the singing voice, but ...


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