One of the first arcade games to feature a vocal track, and that title song still goes unreasonably hard for 1987. "Psycho Soldier" itself is this catchy J-pop anthem with actual sung lyrics coming out of arcade hardware, which was wild at the time.
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The battle themes underneath are classic SNK, all punchy FM synthesis and rapid-fire percussion pushing through the Famicom's limited channels. "Blue Subterranean Lake" has this eerie descending melody that sticks with you.
"Wounded Blue Moon" closes it out with surprising emotional weight. Short release, only six tracks including narration, but it's a genuine piece of gaming history. If you care about the origins of vocal tracks in games, this is ground zero.