I don't think there is a score of the Goldbergs that in electronic format, that is free, that can be edited, arranged, transposed, have parts extracted, export to MIDI, and so forth. That's not exciting at all? I also don't think there's a top notch recording that can be obtained and used, in any context, without any consideration of copyright or theft or piracy. Interestingly, the tech crowd on Slashdot loved the idea.
Well, we're not slashdot technerds here.... Which you would have known had you lurked around a bit before posting (always a good thing to do....)
Most of us here would be content just to play and study the Goldbergs rather than transpose, edit, or arrange them. Or, god forbid, turn them into MIDI
So, the Well Tempered Clavier next ? Then the cantatas and Brandenburg Concertos ? Setting Bach free seems a huge task...