Samurai Shodown 5 is known by some as Samurai Shodown X... I don't know why.
Samurai Spirits Zero = Samurai Shodown V = Samurai Shodown 5 = Samurai Shodown X...? Anyway, this might help:
http://gh.ffshrine.org/soundtracks/6301
Update: I downloaded a few tracks and strangely this is just the music from Samurai Shodown 4 / IV (NEO•GEO CD version)...