That hollow, alien hum when the title screen loads. Metroid on Famicom Disk System basically invented what isolation sounds like in a video game, and this Game Sound Museum release captures every bit of it. Brinstar (Rock Stage) has that bouncy, almost funky bassline that somehow makes an alien planet feel alive.
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Norfair (Flame Stage) turns up the heat with a more aggressive, anxious loop. And then Escape hits and suddenly everything is panic and countdown timers. The FDS hardware gives these tracks a slightly warmer, wavier quality than the NES cart version.
There's a thickness to the channels that adds to the dread. Samus's Item Obtainment Jingle alone is burned into the brains of millions. Probably yours too. If you've been meaning to revisit Zebes without booting up the console, this is your way in.