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You thought going back to 2014 was "early works" for me? Try 2008 for a change.
Remember the thing I mentioned about finding fugues fascinating? This was one of the first results of that fascination. At the young age of 14 I wrote a four-movement organ concertino, although I should mention that the second and fourth movement were essentially identical except for the last couple of bars.
Today I want to show you the first two movements. Why not all of them? Well, I found it extremely difficult to get satisfactory results from having the third movement played by NotePerformer, and since the second and fourth movement are the same, not too much is actually lost. So enjoy!

(Note: All the voice leading mistakes have been kept like in the original manuscript. Today I probably wouldn't make all of them, I assume... maybe?)