As I pointed out previously GarageBand will allow you to make some generic genré music. It's not great but it will do in a pinch. Here's a little piece I created. I did nothing to the parameters, all I did was push the Latin button.
While experimenting with this I figured I would be able to record various versions of the same piece using different instruments. I also found I will be able to silence all but one instrument which gives a sometimes interesting effect.
I'll still be looking for better Creative Commons music but I definitely will keep this in mind.