If you can solder, hacking a keyboard is dead easy. For a jukebox project, it'd work really well.
Someone recently posted a howto on keyboard hacking. They well all out and put it inside a project box. This tutorial was awesome, with one major thing that I would have changed:
They soldered wires to every lead on the keyboard PCB, then labeled the wires 1-36. What they *should* have done was label the first of the sets A-H, and the next ones 1-28 (or however many there were). Using the example I gave makes it much easier to cross-reference a particular keyset. Let's see how my table skills are holding up...
I'm not sure how to make the lines appear on the table, so just pretend they're there.