On the Western side, I'd say about fifteen or so thus far, not counting the joke ones. There are around ten OCR projects, the VGMix-oriented Cave Story project, a couple of OneUp Studios EPs, the independent Bound Together (and its rerelease), and Mazedude's album. Might be more, but that's what I've got off the top of my head.
Japanese, I have no idea. The only ones I can think of are the Celestia projects, which aren't even divided into CDs as far as I can remember (or at least the first one wasn't). Doesn't mean there aren't 50 million I haven't heard of before, though.
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