What you're hearing are the original samples used to create Gangplank Galleon from Donkey Kong Country, combined with the music instruction data from the game, plus mixing and mastering magic for a perfect recreation of what a studio recording would have sounded like.

All remasters currently progressed:
https://www.dropbox.com/sh/g70cosiqz1...

Song composed by David Wise, restored by Jammin' Sam Miller