Let's say you're pen-testing (or breaking into) a business. You need to install certain software on a computer inside the company, but whenever you enter the building you're searched. You've tried sneaking in a CD, even a mini-CD, but the guards always find it. What do you do?
Well, next time, you burn your progarms onto a cd, and write "Thrash metal mix #7" on the disk. They take the disk away, put it into their CD player, and of course it doesn't work. It's taken away from you. Now what?
Well, I was thinking, it would be a cool idea to burn a few choice songs on it, then add a data section with your evil programs. Then, when they check your disk, they find a thrash metal cd, give it back to you, and let you through.
That's kind of a neat scenario