Here's an alteration to that trick that might be a little easier, in that you can skip all the AppleScript stuff.
If there is a particular song you like to wake up to, for this example I'll call it "Start Me Up.mp3", then you can add a line to your /etc/crontab file with the command
open "/MusicFolder/Start Me Up.mp3"
Regardless of what iTunes is doing, it will start playing that song when the Cron event is tripped. Ain't it sweet?
