Is it possible to add custom music to the game?

Here's another way to do it: 1. In the Map Properties Tree, find Music and click on "...". 2. Choose any theme for the heroes (in my case, it's Godric). 3. Enter "SomeMusicName.ogg" instead of "Heroes-Godric.ogg". Make sure that the music is in OGG format and put this music into the Music/AdvMap-Heroes folder. 4. PROFIT