Music is the weakest aspect of Heroes 5. There's very little battle music, and what there is feels rather bland.
Therefore, I decided to take matters into my own hands and developed a corresponding mod, which you can read about in this section:
/topic/8019/
You can listen to the tracks I propose individually at these links:
http://bnserver.ru/24254788 (Academy2)
http://bnserver.ru/24254789 (Dungeon2)
http://bnserver.ru/24254790 (Haven3)
http://bnserver.ru/24254791 (Necropolis2)
http://bnserver.ru/24254792 (All2)
http://bnserver.ru/24254793 (All3)
http://bnserver.ru/24254794 (All4)
http://bnserver.ru/24254795 (All5)
http://bnserver.ru/24254796 (Sylvan2)
http://bnserver.ru/24254797 (Main Menu)