Just a quick note here, that just because something is licensed under Creative Commons, it doesn't necessarily give you the right to use it in a video. There are many different types of Creative Commons, each with different rights associated with it. For instance, many things under Creative Commons doesn't allow commercial use (meaning that you make money off of it), which would technically not allow use in any videos with AdSense on it (or with a sponsored product, etc).
What the heck are you smoking?
No matter what type of music it is, it's bound under copyright. In fact, in the majority of Europe, you don't even need to apply for copyright for any creation - copyright is automatically created and applied to ANY unique object (it's of course more complicated than this, but for a forum post, this will suffice) created by you. It doesn't matter if it's instrumental or not.
That's a bit of a misnomer. In the majority of first world countries, all music is automatically copyrighted. And even if something isn't bound under copyright, that still doesn't allow you to use the creation of someone else (so even if someone failed to get copyright in the US copyright court (sorry, I don't know the correct term for this in the US), that still wouldn't give YOU the right to use it).
You are only allowed to use music that you either purchase with a license to use it, have permission from the author, or has been published under another license that gives you that right.