That 1987 Japanese vocal version of Psycho Soldier's theme is genuinely one of the earliest vocal tracks in arcade game history and it still goes. SNK's 40th Anniversary Collection soundtrack on Switch packages decades of arcade hardware sound into one set.
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Ikari Warriors hits with that raw, aggressive chiptune energy that made you feel invincible dropping grenades. Crystalis brings something completely different, this melodic NES-era RPG warmth that stands out hard against all the action game tracks.
Then they close with Psycho Soldier 2018 and KoF XIV's Ikari arrangement, modernized versions that let you hear how far the compositions traveled. Prehistoric Isle just rattling in the background. If you care about arcade music history at all, this collection is basically required listening.