Part of the joy of music is listening to lots of different kinds of music and learning from it. Specifically for me I like writing songs that move me and what moves me are beautiful songs on the piano or the guitar and really really heavy music.
I didn't go to film school so my learning was done out in public and showed up on the screen.
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But the mechanics of learning to 'throw your voice' are pretty simple. Anyone with a tongue an upper palate teeth and a normal speaking voice can learn ventriloquism.