Two tracks of pure 1986 MSX charm right here. Takahashi Meijin no Boukenjima, the Japanese original of Adventure Island, came with this tiny soundtrack release featuring the theme song and a longer synchronized version. The theme song has vocals by Toshiyuki Takahashi himself, the real-life "Master Takahashi" who was basically a celebrity speedrunner before that was a thing.
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The Synchronized Boukenjima track runs over eight minutes and layers narration over the original game audio in this wild radio-drama style. It's barely a soundtrack in the traditional sense. More like a time capsule of mid-80s Japanese gaming culture when Hudson Soft was king and button-mashing was a spectator sport.