You don't need hundreds of free music files, you want them, apparently just as a reward for being you. It's nice to want things.
You will not find a web site that has an extensive archive of video game MP3s for you to download at will without paying for it. Web space and bandwidth cost money and therefore anybody with enough to host a shitload of video game MP3s must be making some kind of money off of it just to keep it running.
Now, what you can do is check out <a href=
http://www.vgmusic.com>VGMusic</a>, which is easily the best online resource for video game music files, but you will only find MIDIs there because unlike MP3s they aren't huge. That's the best you're going to get.