Faction-specific music

The update 4 content shows that the devs care about making the Iron Teeth more distinct from the Folktails and I like that.

I feel like having different music for each faction would really help to bring a different vibe when switching from one to the other, making them even more distinct while adding a bit of music diversity to the game. It could also help developping the "personnality" and the culture of each faction.

For exemple, maybe the Folktail music could be a bit calmer, cheerful and rely more on wind/string instruments than Iron Teeth music, whereas the latter could be a bit more pressing, motivating and use a bit more percussion or metallical instruments? The current soundtrack could be splitted and redistributed between the two factions, with the addition of new pieces of music.