That is pretty incredible. I didn't know it could possibly be that easy.
I'm guessing that companies like TouchTunes and ECast have some kind of special licensing agreement then.
I guess the other question is, too: Could you really get in trouble for the mp3 thing if you kept the ENTIRE catalog of ORIGINAL CD's on site with the jukebox if there was ever an infringement question? It would just be easier to stash a small computer inside your jukebox than interface it with a 300 disc changer.