The Music of Boktai
Here you can listen to the soundtrack of Boktai: The Sun is in Your Hand 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's soundtrack was composed by Kazuki Muraoka, Masashi Watanabe, Norihiko Hibino, and Shuichi Kobori.
The first game's soundtrack helps set its dark, gothic tone. The tracks are a little more generally mysterious and adventurous than its sequels, and is not yet shot through with the Spaghetti Western motifs that come to define the series.
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.