Otari MX5050 8-track. We'll fill that role ourselves if necessary, though. I think that people in general are inherently creative, and work and dedication can help bring out that potential. Some people do seem to just be wired better for different things, though. I'm not sure if that ability is inherited or cultivated, though.
Greatness is pretty subjective anyway.
Hard to judge. Inborn talent obviously plays its role, but maybe the harder you listen, the shorter the trip becomes. In my opinion, there is very little that isn't practicable. You can be deliberate. And I feel that even the idea of vision is practicable.