inb4 "mod is outdated use fl studio lmms it dont support vst's etc"

The nice thing about the format is that it self-serves as the source for easy GPL compliance.  I try to encourage this format for my project for years to no avail  :(

and then there's the strange issue of some games 'updating' mod music to OGG instead, destroying their looping, making the game's filesize much larger as well as more dependency and overhead.  Forks of TuxRacer come to mind

Another big problem are samples.  There's not many Free Software compliant instrument samples out there that sound good which could be a factor into VST reliance...

Mod archive (http://modarchive.org/) has music under various licenses:

http://modarchive.org/index.php?request=view_by_license&query=publicdomain

But I agree, it would be nice to have some additional mod style music.

I wouldn't touch that site with a 107-foot pole when it comes to licenses.  They have several songs that shouldn't be public domain, like that cover of ABBA's Dancing Queen for an obvious example.

@undesired Well, law isn't cement, there's always a loophole here and there. If  they claim it as a parody or fan tribute, they can't get in trouble for it - you however don't have plausible deniability, so yeah - avoid.

 Regards-