I think it would be a cool idea to completely turn off the battle music wothout muting the normal ingame music because the battle music is killing the immersion from the nice other ingame music.
Then another point is the constantly switching music when youre moving a bit on some places like sinchole. I have a base at sinchole and when im moving around one music song stops in the middle of it and another one starts. It would be cool when one song plays till the end before the other starts.