So, this is kind of and oldie but a goodie.
Some guy has a website running the AC OST on loop throughout the day. I actually stuck to it for a couple weeks straight - now I go back once in a while. Waking up to the 7AM/8AM music is pretty awesome.
One drawback - it loops, but not perfectly. Rather it plays the 15min video, then reloads the page. It will update on the hour, though.