Okay, so I researched some and I've read that, "Article 6 of the 1991 EU Computer Programs Directive allows reverse engineering for the purposes of interoperability, but prohibits it for the purposes of creating a competing product, and also prohibits the public release of information obtained though reverse engineering of software."
Notice the last statement. It says that it's illegal to reverse engineer stuff if you intend to release the info, in this case the chiptunes, which are info, into the public.
So, I can't really justify my actions. I downloaded the chiptunes and used them to display the songs on the internet. The displaying of the songs may be fair use, but the way I obtained the songs is, in the end, not.
So, I'm sorry but I'm going to have to take down the songs because I wouldn't want people to take my stuff and reverse engineer it if I said not to. Even if I forgot, I would still like others to ask first.
But, that makes me ask myself, "Is there a chance that I could get permission from the copyright holders?" Does anyone know how likely this is? I remember that one guy wanted to make a mod for Unreal 3 that is basically a remake of Duke Nukem 3D, and he got permission from the copyright holder to do so.