Original: means it is the first recorded version. This means it is performed by the person who wrote it, or the person it was written for.

Remix: used in a production context, where the reconstruction is made using DAWs, effects, synths, edits, etc, most commonly associated with electronic music.

Cover: often used in a singer/band context, where the artist performs a song from another artist, most commonly associated with pop/rock. 

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