Nine Inch Nails’ Trent Reznor released “The Hand that Feeds” as a GarageBand song. The NIN website has a 70Mb Stuffit archive. He says in the README:
For quite some time I’ve been interested in the idea of allowing you the ability to tinker around with my tracks - to create remixes, experiment, embellish or destroy what’s there. I tried a few years ago to do this in shockwave with very limited results.
After spending some quality time sitting in hotel rooms on a press tour, it dawned on me that the technology now exists and is already in the hands of some of you. I got to work experimenting and came up with something I think you’ll enjoy.
The license says you can play with the files, but you can’t redistribute it or use it for commercial use without a different license. Still, it’s very cool.