These days, most of us are using some kind of “service” for getting music. SEGA has released quite a few soundtracks across these platforms (including, most recently, the Panzer Dragoon series), but the Phantasy Star selections are a bit thin at the moment, consisting of only three official soundtracks on Spotify and Apple Music. The good news is that one of the soundtracks is Phantasy Star Zero. Composed by Hideaki Kobayashi and Tadashi Kinukawa, the OST is full of aural throwbacks to the original PSO soundtrack, with some cool western vibes in places. An underrated OST for an underrated game, and well worth your time.
If you want more Phantasy Star (and SEGA) music, head over to Radio SEGA!