You finally have to learn to pull all the different kinds of teaching and training and coaching together on you own, so that your voice and body and technique for a sound that is consistent and solid.
I didn't change my voice for 'The Boondocks.'
The voice changes very slowly. I keep mine well under control and try with all my might to keep it exactly as it was at the very beginning.
And fortunately, I haven't had any problem with my voice. I've been able to sing at a level of consistency that the people are expecting.
I believe my voice is pretty much the same. I've written 75 books, so I'm better at it now than I was earlier in my career.
I do agree that when a singer sings all the songs for one actor in a film, the impact is much better.
My voice hasn't changed really very much. I still do all my songs when I perform live and still do them in the original keys. I've been blessed with that ability to retain that.
I have songs that sound like this and songs that sound like that. I think it's just my vocal that keeps it all together.