Answer:
all of them!
i cant really see them ;)
but all of them!
Audrey Hepburn's singing voice in My Fair Lady was dubbed by the soprano Marni Nixon.
The director wants a chance to get to know the person. When a director is casting, they are keeping a lot of things in mind such as whether this is a person who takes direction or whether this person is and enjoyable person to work with. Hope this helps :)
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