The Legends of Heroes: Trails of Cold Steel has some of the best battle themes I've ever heard.
https://www.youtube.com/watch?v=jgTw9TMhW0g (Normal Battle)
https://www.youtube.com/watch?v=B6Zde1VFRp8 (Practical Exam)
https://www.youtube.com/watch?v=TrChxzDc4B0 (Boss/Strong Foe)
https://www.youtube.com/watch?v=-sSureeCbCg (plays randomly at epic moments)
PSN: extremeM
PlayStation Vita Japanese Software Sales (Media Create Physical/ Famitsu Digital)