I was driving home listening to the overture to some Wagner opera, Tannhauser, I guess, and it occurred to me that nearly every science fiction story of the cruder type featured an evil scientist bent on taking over the world. How about evil artists? Are they common in reality or fiction? Wagner certainly fits the profile - a very bad man who wrote very good music.
Now I've met a few evil scientists, but none of them actually seemed bent on taking over the world. Mostly they seemed to be focussed on making associate professor or some similarly mundane ambition. Wagner, though, was the sort to be bent on world domination.