Fact is, as classical musicians we're not used to think in terms of original or cover. Would a jazz musician call his improvisation on an existing tune or song a cover?
The rules of the contest are more fit for pop songs than for other types of music.
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That's true! Can you play Bach's cover of the BWV 565 please?
If there were a cover by Bach of BWV 565 that would mean he didn't compose it.
Which is actually what musicologists think nowadays: Bach did not compose his most famous organ work, somebody else did (with J. P. Kellner as a likely candidate).