Yea, I dont think the mod works. I may have found the problem though, all of the files are MP3 and while I did read somewhere that the game should take MP3's, I've seen another song mod with all files as OGG and it worked. So I might suggest converting all of those MP3's to OGG's and see if it works then, or I could just not be doing something right, though I did follow your guide.
Edit: Found the Issue