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putting any rock music into the game is nonsense. Heroes is first and foremost a GAME. It should have its own unique musical theme; no rock, rap, pop, metal, or any other nonsense should be played.
Want everyday music? Play it in Winamp. Personally, I want to hear something other than another Bolt Thrower track or some black and white garbage when I'm building a building or buffing my units. Of course, it's not Gothic, I'm exaggerating, but still.
This might work for games like CS, Serious Sam, or GTA, where external music is fine, but not for Heroes.
I almost like the soundtrack; the only thing that annoys me is the same, brain-numbing melody that never changes. Sometimes it's like that.