Shin Bokura no Taiyou: Gyakushuu no Sabata or in English, Boktai 3: Sabata's Counterattack
The Boktai series has some great tracks, but I picked the third one because there's a few ones in it that I love.
- I've always loved this track since the first time I heard it, and it has great energy to it.Dark Boy's Revenge - It also holds an arrangement of Dark Boy from the original Boktai (a track I got remixed in the FBRC2010 thanks to Moseph), so I shouldn't need to say how much I love it.
Pirate Island - Great dungeon tune, nice pace. Had a great adventurous feel to it.
Bike Battle - The game also features Bike Battle stages, most of which are completely optional. They're pretty fun too, and the music has a great pace to it.
Crossover - The games also had crossover functionality with the last three Battle Network games, though due to this game not coming out in the states the functionality was removed from Battle Network 6.
It's a great soundtrack (all the games have their gems), and I love it.