IMO, dungeons need to have their themes looped, and there needs to be an option to switch off the battle theme transition for common fights. Right now, the only dungeons that have constant, looping themes are Meridianum and the Praetorium.

I'm not saying remove the boss themes, but instead make the common battle theme toggle-able, and allow those who want to listen to the dungeon song during the run do so.

If it's ambient noise you wanna hear - just mute the BGM. I kinda believe that dungeons have that feel that's ruined by the way things are now.