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Another advantage of your maps is that they are rich in treasures. Chests, sulfur, mercury, etc. When you start playing on the last level, and you have no money or supplies, this helps. Moreover, you try to calculate each move, what to take first, so that you can build a capitol as quickly as possible.
As for the music in the cities, I haven't experimented with it. When I was in university, we had a group of Heroes fans, and we tried to find the most suitable music for each city. We even often argued about which composition would be best.