That hypnotic in-game loop burrowing into your skull after one quarter. Xevious basically defined what a shoot-em-up should sound like when Namco dropped it in arcades in 1982, and this 2009 collection preserves every beep and blast.
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The Zapper shots have this satisfying high-pitched pulse, and the Blaster firing sounds completely different, giving you that split-second audio feedback for air versus ground targeting. Andor Genesis's appearance sound still triggers fight-or-flight in anyone who spent time with this cabinet.
The Name Entry jingle is somehow nostalgic even if you never played it. More sound design document than traditional soundtrack. The in-game music itself is minimal, just a looping melodic phrase over silence and explosions.
If you care about arcade audio history, this is foundational stuff.