So I just beat chapter 4, the music in the second part (the waste processing area) was fucking awesome. I really like the music in the game, it doesn't lack the "punch" and bombast of some of the other FF scores, but the songs are catchy and they don't get too repetitive. Wish I could say the same for the dungeon areas though.
Fight with Odin was a pain in the ass, took me like 6 tries to beat him. I'm not really feeling the eidolon fights, especially the time limit. Battle system is at least getting more interesting, it feels like FFXII done right, with the auto battles and the preset strategies (a serious flaw with 12 is you couldn't have several different gambit setups that allowed you to cycle through them at will). I don't understand why they took so long to take the training wheels off... the first 2 chapters make Mystic Quest look like Knights in the Nightmare in terms of complexity.