As an actor, you most often play relatively average parts, so to get to play extreme versions of anything, those are the most exciting parts.
I always wanted to play a Greek god in something.
If you're going to use standards as criteria for signing musicians, you can sign thousands. If you're going to use some sort of conceptual interpretation that's based on the tradition of those standards, but is trying to move away from it, you're down to about 10 people or so.
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