I never been much of a pokeyman man, but I've always been able to appreciate various songs throughout the series. Especially them town themes.
Now, this is a very difficult topic for me, as I have several games and series that I love the soundtracks of, but for now I'll just say Shin Megami Tensei IV. Whole game is filled with awesome battle songs, depressing location themes, and comfy shop themes, just like the rest of the series.
Map theme
Shop theme
Overly-aggressive Xylophone theme
Even from this sole OST, there is too much for me to pick from.
Holy shit this battle theme is so insane... maybe i'll give this game a try or just listen to the entire OST since i usually don't like turn based rpg games.
I don't play many turn based RPGs myself, but Megami Tensei is the one series that just clicked for me, probably due to all the customization for demon skills, and how I normally don't have dead weight party members. Music, setting, and religious elements are also a big draw for me.
One more track from IV, this is just the default battle theme for random encounters.