Is war necessary on high difficulty levels for a culture victory?

[sendos]

The issue with internet is that by the time you get it, a science victory is also in the cards.

So far, I find cultural victory the hardest peaceful victory, even with an intense focus on culture, aestethics and tourism. Perhaps I should use all musicians as bombs instead of getting great works, but I see this as a short term thing. And I still don't know any noticeable differences in doubled theming bonuses from aestethics.