I actually prefer the third game, and I try not to even remember the fourth...
A week ago, I saw a disk with Heroes 4 in the exchange, and I took it just out of curiosity... The first few minutes of the game shocked me, but then I started to feel nauseous from the glossy 3D graphics, and I just deleted the game from my computer... now I'm sitting here, regretting that I spent 30 rubles on the exchange :)
I know how the gameplay is, but in the third game, the graphics are even better! I don't know about the music, but "Era - ameno" was playing in the menu.