The Music of Boktai 2
Here you can listen to the soundtrack of Boktai 2: Solar Boy Django for as long as this playlist is hosted on YouTube. Shout-out to DarkSun493 for uploading all of this!
This soundtrack is also hosted for download at Zophar's Domain.
Boktai 2's soundtrack was composed by Kazuki Muraoka, Masashi Watanabe, Norihiko Hibino, and Shuichi Kobori.
The second game's soundtrack hits upon an explicitly Spghetti Western-sounding theme, and leans all the way into it from the beginning. Lots of high-pitched flutes, horns, almost military-sounding drumbeats, churchbell strikes, and deep, ominous vocalizations bring a unifying theme to Boktai 2's soundtrack and story.
East of the Sun & West of the Moon
[Listen on the Internet Archive]
Boktai Sound Rare Tracks: East of the Sun & West of the Moon was a limited-release soundtrack given out with early pre-orders of Boktai DS in Japan.
It contains previously unreleased orchestral versions of title tracks and other music from all 4 Boktai games.